To everyone complaining that Jobs once said that styluses are terrible, can you please consider the context it was said in before using it as an argument?
Think waaaaay back to the 90's. The first phones had button-only interfaces. Then along came the stylus and made input a little more natural than using buttons. The problem was, if you lost your stylus, you lost a lot of functionality. If I recall correctly, you could try pressing those on-screen buttons with your finger, but it sure wasn't easy - these phones were designed for the precise input provided by the stylus (small screens, small buttons, handwriting recognition - sometimes with a special alphabet you had to learn...)
Looks to me like Apple saw that touch screens were better than button interfaces, but clearly the stylus interface was imperfect due to, well, the NEED for an additional, easily misplaced piece of equipment. So they eliminated the stylus, made the screen bigger, designed multi-touch, and made a touch keyboard that's as easy to use as (or arguably easier than) handwriting input. Of course Jobs hated styluses on phones - they were annoying and unnecessary.
But a tablet (assuming it is coming)... that would not be just a large iPhone. It's a bigger screen, different form factor. Perhaps Apple envisions (or has envisioned at some point) the applications for this thing that would benefit from input more precise than a finger can provide. Saaay, taking notes without looking at the screen.
In the context of multi-touch and a decent on-screen keyboard, supporting precise input via something like a stylus would actually enhance the product (IF the stylus is not necessary for a good user experience operating the device). If Apple decides that the stylus is the best way to support precise input, they'll make their products compatible with it. But you won't see them coming out with a tablet that requires precise input or ONLY accepts stylus-based input.
It's subtle, but there's a major difference between stylus-only and stylus-compatible.