well, if its not gonna be out till like 2007-2008 or something then of course it should be 3D, computers and graphics are advancing very fast ya know. but it does depend HOW they do it, for SC 2 it would have to be done exactly right for it to fit in with SC/BW.
But hey, i dont really care too much about graphics, hell i'd play it if it was 256's colours. its not the graphics that are important, its the gameplay, ofcourse the graphics set that up in a way but the more pixely the graphics, the easier to get it right. anyway, i just wanna see what happens in it.