If it is Blizzard I always preorder, yeah have a preorder out for the ce of burning crusadse, im a blizzard addict
Otherwise i just wait and see.
I have been lucky enought to get to E3 a couple of times now so I can say been there done that. But really I think it was better show for ppl who stayed home. Its so loud in there you can barely hear ppl talk, and all theese neon flash and other stuff makes your eyes tired and head hurt. Also there was to much to see on to little time so you just run around like some mad man trying not to miss anything.
I think you can say E3 is a sort of love/hate-releationship. Should be intresteting to see what happens to gdc now when E3 is downsized.