Same thing crossed my mind, then I remembered that I wouldn't really be getting much from the 3->4 upgrade since I don't use Xcode itself. I'm guessing they'll

Same thing crossed my mind, then I remembered that I wouldn't really be getting much from the 3->4 upgrade since I don't use Xcode itself. I'm guessing they'll something similar to what they typically do with iLife (and, more recently, FaceTime): Charge existing customers for upgrades, but offer it for free with new (operating?) systems. Regardless, Xcode 3 is still available as a free download.