I'm bad at this, and am probably going to be wrong on multiple counts, but anyways:

1) Apple WILL announce a table on January 27th, no idea when it will ship.

2) It will run a 3rd variant of Mac OS X (not the stripped down iPhone OSX, but not the full-blown OS, either).

3) It will have a front-facing camera and include video chat capability.

4) Apple will have been in negotiations with publishers and universities to offer the tablet to some universities students as an alternative to physical textbooks.

5) It will include 3G capabilities, but will not require you to sign up with a carrier for data.

6) You will be able to tether the tablet off your iPhone's data connection.

7) Form factor will be like an iPhone, but bitter.

8) It won't fold.

9) It won't have a physical keyboard (am I gonna be wrong here?).

10) It will have it's own "class" of applications in the app store, Apple will provide some tools in the next SDK to allow for some sort of "write-once-run-on-both-iPhone-and-iTabletThing" capabilities.

11) It'll have Wi-Fi. Duh.

12) I'll want one.