Wow, come on people. I say once again, why don't you wait for the phone to come out before you spew out what you just simply think is true? Or what you're convincing yourself is true based on anger that you maybe had to buy an iPhone 4S to have this feature? How many of you have taken the iPhone 4S apart and dissected its abilities? Anyone? No. That's what I thought.
I'd believe a developer over an average Joe any day. That's all we can go off of. Yes, this was likely partially a marketing strategy, but I am willing to bet that iPhone 4 cannot run Siri as smoothly as it was intended. If that pisses you off, suck it up and deal with it. Apple are perfectionists, and I like it that way. When one of you takes the iPhone 4S apart and proves one opinion or the other, then it will be more relevant. Right now, I'm sorry, but us iPhone 4 users are S.O.L. No reason for bitterness or hostility. No one has any facts yet.
Chill out. In two days you guys will know everything.