I feel it's like a Jigsaw and the individual pieces are taking a while to put together.
The iPad has helped give everyone a market, set the standard if you must, and it's a very high one to hit.
They must know releasing anything will instantly draw comparisons against the iPad, so unless it's just a cheap device (aiming low) they'd be stupid to even try and release anything now as it would die before it even got of the starting blocks.
Nvidea has much of the chippery, Android can allow the OS and apps, it's all going to take time.
I'm guessing here, but possibly at some point in time it's going to be a trickle then all of a sudden the dam will burst and we'll have pages of Tablet reviews in the magazines.
As I say, I feel they are still working on the individual bits of the jigsaw, but once all the elements are in place what's to stop it?
I'm feeling very positive about all of this. The iPad I hope will set the bedrock and we're going to see a gradual but important change in media consumption (ok, for the minority at first due to price)
Android devices (I guess) will come in time, they will of course, try and out iPad Apple by adding missing options (card slots, usb ports etc) Apple will then come back with even better hardware to put Android back in it's place.
The only way is up (as Yazz would say)
And things can only get better (as D: Ream would say)
And we're right in there at the start of the (possible/hopeful) revolution