Not that I won't be jumping for joy regardless, but...why do you say that?
The upgrade from iPhone 3GS to iPhone 4 added (among other things):
A retina display, a faster clocked and more advanced processor, a faster clocked GPU, a wider bus, more RAM, a penta-band radio and 802.11n, and the same height but significantly less width and depth.
And, oh yeah, a higher capacity, longer lasting battery.
I'm not saying the iPad's situation is identical, of course, but it wouldn't be unheard of for Apple.
Agreed. I can't imagine Apple announcing this product and reporting it having less battery life than what we have now. I just can't imagine getting anything more out of it if there are as many upgrades to the inside as have been rumored.