I tried this with my combined discs folder for Mass Effect 2 (which I own) and got the same result. The folder was over 9 GB, but the ISO would not get bigger than about 4.5 GB. I don't know about this game because it isn't released yet, but it is likely to have the same issue.
I assume that the Xbox 360 ISO file format and the GOD (which is just another form of this split into chunks) do not support games over the size of a DVD DL. This is probably why the makers of ISO2GOD haven't made a FILES2GOD yet. Try createisogood.
no piracy-support etc. etc. this will go to landfill. sorry, but if you're not experienced enough to understand a program as simple as iso2god, you shouldn't be using a jtag. just my 2 cents
Just another troll that wishes it was a moderator.