You haven't seen anything yet...
Originally, the iPads were going to be $100 cheaper across the board, when Gen II is sold, they'll drop the current prices of Gen I by $100 or more, and keep the rest of the industry off balance on the price point, they'll have figured out some ways to save $ on manufacturing costs by then, and still make $ hand over fist.
I'm seeing speculation that the next iPad will have CDMA and GSM radios (they can easily find the space to put in the larger chipset in an iPad), the iPhone is relatively space constrained because of it's form factor.
I think Moto is the next corporation to pull off a decent tablet. With Moto's know how and Google's help, it should be pretty slick, think collaboration like they had with the Moto Droid Gen I.