I still have major doubts on this being the next iPhone.
First off, I don't get why people need tablets. Apple's iPhone provides Web/Movie/Music/Email/Apps/Cell wherever you go; plus it fits right in your pocket. You don't have to have a bunch of stuff around - its an all-in-one. Also, when watching movies on it, it's easy to hold (as opposed to a tablet device).
If you want more computing power, MacBooks offer that. If you're going to carry a tablet around, you can just easily carry a MacBook. And a MacBook will definitely be a lot more powerful than a tablet. Also, the MacBook will have a real keyboard, sound, screen, and won't be obsolete as fast a tablet would.
Third, a tablet from Apple will be expensive. Why would you spend $700 to get a sub-par computing experience? (Well, people into gimmicks will buy it). If it's subsidized through a carrier to a cheap price, who the hell wants to tackle ANOTHER data plan if you have an iPhone. You would be paying at least $50+ to have to devices that do internet when you would be only using one at a time. For some people, you would be paying for *real* internet at home, iPhone data, and Tablet data.
I still personally think tablets are way gimmicky -especially when an iPhone is capable of so much. And you just carry it in your pocket.
I really think people just get so hyped into new products before they come out that they don't think things through. This product will be as successful as the Apple TV, maybe bit more to iPod shuffle status.