I found out from a tweet by Pete_the_Duck that Forge Island is on the marketplace and available for download!
So of course I checked this out on XBOX.com:
Sure enough after downloading it from the net to my XBOX, I was able to start forging right away!
Welcome to Forge Island!!
Above are the new rocks. Just look at that amazing rock wall and immense spire. Not to mention a GREEN SCREEN!!!! OMG, this is going to help my new Halo web series “MaC Rounds” out so much!
As you can see I rotated one of the rock walls and placed it on top of a coliseum wall. As well, I placed a 1×1 block roughly in the middle of those two to show size: 
The rock wall is HUGE!
Here’s that beautiful green screen!
And look trees! (There are actually only 3 versions, however the tallest has a truck so tall that it enables you to have great variance in height of trees) The shortest below is also the tallest, just with it’s truck mostly submerged into the ground.
And last but not least a worm’s eye view of the above (really it’s Spartan height, but you feel like a worm…)
Have at it folks! It’s FREE!!!!!!!
-Sal