My understanding is that the current technology for multitouch disallows use of stylus (or anything other than actual fingers), due to relying on capacitive digitizers. If so, that would leave out a lot of uses (including hand writing recognition I should think). If the next-gen device is going to have multitouch I hope the technology has moved pass that limitation for sure.
Its a cat and mouse game which, if telcos want to win, means many people will lose. Ie. ban of cryptographic protocols, or only allow specific protocols.