Just confirmed by Dan Ayoub, Executive Producer of 343, Forge WILL be in the Master Chief Collection.
You will be able to Forge in Halo 2 Anniversary (AWESOME), Halo 3 and Halo 4!!!
This just keeps getting better and better.
This was via IGN’s live feed.
-Sal
Forge is in Halo CE anniversary as it was already in the game when we got it in 2011, so its built in already
Actually that was Forge in Reach that used the Halo CE maps. NOT CE: Anniversary itself. Only 2, 3 and 4 are confirmed to have Forge in the Master Chief Collection.
ahh fair shout there