I genuinely believe that the commonwealth will be in fallout 4
That very well may be true. The Commonwealth apparently is the entire state of Massachusetts, which would be a little big for a DLC.
My only hope though, is that if FO4 is in the Commonwealth, that the game is on a better engine. The GameBryo engine is completely unstable :S
It will most likely be on a next-gen console so i'm presuming they will use a different engine, i could be wrong though :shrug:
ehhh don't want to see li or the bastard zimmer
so not not really
Zimmer probably won't be featured in it because in fallout 3 you have the option to kill him, li will most probably be in it, hopefully not essential this time