Okay, first things first, yes, it’s a little strange of a title for the set. However…
THIS is the replacement/reissue of the Builder’s Forge set that barely saw distribution.
I for one am VERY happy to see it released as I had been asking Mega (outside of social media) to re-release the set.

At a robust 450 pieces, the set should retail for between $40-50. There are several alternate/rebuilds with this set!

The instructions included show you how to make this small base, a mongoose and a mini pelican.

The alternate build allows you to expand on the base and you can rebuild parts to make a mini warthog!

I really like the holoboard included in the set!

As seen, the Builder’s Box comes with two Spartans. A Red Gungnir and a Blue EVA. Note the old style energy sword the Gungnir Spartan is holding! We haven’t seen that one in a very long time!

Here is the official text blurb from Mega about this set:

BUILDING BOX
Features
• 450-piece Halo-themed building set with special pieces, unique shapes, builder’s multi-tool and brick separator, and a resealable storage box
• 2 highly collectible micro action figures, Spartan Gungnir and Spartan EVA, with authentic detail, 12 points of articulation and numerous interchangeable weapon accessories
• Includes 3 building ideas to start the mission; many more available online
• Ideal for ages 8 and up, this building set features detailed authenticity to strengthen creative thinking skills
• 450 bricks and pieces combine with all Mega Construx building sets and are compatible with other name brands
Product description
Build your own Halo universe with this 450-piece creative building box. Prepare for battle with 2 micro action figures, special pieces – like wheels, risers, a shield and so many weapon accessories – custom piece shapes and a Halo-themed color palette. The set also comes with 3 building ideas to start your mission. The box even features a resealable flap perfect for storage. This creative construction set is the perfect tool to hone your training, soldier.
Ideal for Probuilders, ages 8 and up
What’s in the box?
450 pieces
2 micro action figures
Set number: GPT03

Well, what do we have here? A new vehicle!

Now, I will say, it does look much like a hollowed out Brute Prowler.
The inner workings of the gear mechanism look cool.

This set gives us a Spartan, 2 Brute Warriors and a Grunt Conscript.

As with the other sets from the Summer 2020 lineup, this has an alternate build as well!
When O first saw the ALT build, I thought it looked much like the skitterer from Halo Wars 2. Perhaps that was the intention? Also, you can build a Banished barrier.
Those both definitely fit within the Banished aesthetic.

Here is the official text blurb from Mega about this set:

SKIFF INTERCEPT™
Features
• Halo Infinite inspired Banished Skiff vehicle building set with rear cockpit, missile launcher, and 360-degree turret that spins when its exhaust is turned
• 2-in-1 building toy: Choose to build the Skiff or a walker vehicle and fortifying wall
• 4 highly collectible micro action figures, Spartan MK VII, 2 Brute Warriors and a Grunt Conscript, with authentic detail, 12 points of articulation, display stands and interchangeable weapon accessories
• Ideal for ages 8 and up, this building set features detailed authenticity to strengthen creative thinking skills
• 452 bricks and pieces combine with all Mega Construx building sets and are compatible with other name brands
Product Description
Take your troops where they’re needed with this Banished Skiff construction set. Inspired by a non-playable vehicle from Halo Infinite, this Skiff features a spinning turret that spins when you turn its exhaust pipe. Or choose to build a walker and fortified cover wall. This playset also includes 4 micro action figures that can be placed inside your vehicle of choice. Relocate to where you’re needed most. 
Ideal for Probuilders, ages 8+
What’s in the box
452 bricks and pieces
4 micro action figures
Set number: GNB21

With 452 pieces, I look for this set to be between $40-50.

The next preview is an UNSC Spartan Armor pack. I’m a bit partial to this one as it’s similar colors to my favorite sports teams.

This set includes 2 Spartans and a Banished Warrior. The Spartans are HIGHLY customizable, with 30 accessories to share between them!

As you can see in the above pic, there is a Banished crate as well.
One thing I’m happy the Mega is doing more of is including the muzzle flashes for guns. This adds a depth of realism to the figures.

Let’s take a look at those included accessories!
There are two extra front torso armor pieces and one each extra back armor. With what we already have to choose from, this is a fantastic amount of torso armor customization.

In the next bubble of accessories, there are weapons and armor. Looks to be two sets each of shoulder armor, the backplates as mentioned before and a couple of weapons. The pistol, seen in the Halo Heroes 12 series is back again. Note it’s ammo drum is removable.

The next bubble includes 4 helmets. Beyond the Grenadier and Recon displayed on the figures, we also get an Operator, EVA, Gungnir and Commando helmets. Really a good selection here!

And finally the last bubble has a few grenades, pistols and various muzzle flashes.

This set retails for $15. At first I thought that might be too high. But when you look at the amount of accessories and the added figure, I think we’re getting a good value. I can’t wait to get this one in hand! I’m probably going to buy several this set so I can make several armor customizations.

Here is the official text blurb from Mega about the UNSC Spartan Armor Pack:

UNSC SPARTAN ARMOR PACK
Features
• 3 highly collectible micro action figures, 2 UNSC Spartans and 1 Brute Warrior, with authentic detail, 12 points of articulation, display stands and interchangeable weapon accessories
• Halo Infinite inspired building set includes a loaded equipment cache with armors, helmets, weapon accessories, and a storage box
• Ideal for ages 8 and up, this building set features detailed authenticity to strengthen creative thinking skills
• Bricks combine with all Mega Construx building sets and are compatible with other name brands
Product Description
Suit up, soldier. Equip your UNSC Spartan fireteam from an armor cache so versatile it’ll feel like you have an infinite number of modifications to choose from. This construction set features 3 combat-ready micro action figures, Spartan Grenadier, Spartan Recon, and a Brute Warrior. Gear up with numerous armors, helmets, weapon accessories, and more – then take the enemy down.
Ideal for Probuilders, ages 8+
What’s in the box?
3 micro action figures
106 pieces
Set number: GRN07