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This is all the info I can give you.

It is running full-blown OSX.
It will be very revolutionary in a way I can't tell you.
Apple will be releasing it Q1 2010.

No more info.

A big tablet needs nothing more obvious than a MacBook air form factor with flash drive on circuit board, no keyboard, touchscreen and we get a computer the size of a magazine. I think that's awesome but not really very revolutionary.

The (nearly) very revolutionary bits we need:
* support for secured smart card credit card transactions
* fingerprint or retinal scan or face recognition access control
* built-in digital TV tuner
* books, magazines and newspapers on iTunes

The best commercial revolutionary bits are patentable, so perhaps:
* magsafe docking as well as power connector
* environmental protection - magsafe dock would be water and sandproof

I hope not to be disappointed.
 
As far as I'm concerned this thing must have a proper keyboard.[...]

Any device can have a bluetooth keyboard, so that's no issue. Expect a new super thin bluetooth keyboard to go with the tablet, but it will be an optional extra.
 
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