Terminator 4 Without Arnold?

I think The Govenator is going to do a cameo appearance. Does anybody have a clue as to who playing The Terminator in part 4

If Arnold is only doing a cameo, then obviously T4 will be about something else.

i havent read the past posts far back but when Arnold finishes his stint he will be going back for T4 thats what i read in an Arnie interview in a uk supplement m

Well Arnold is going to be starring in True Lies 2 so most likely he will star in T4

No Arnold...