I pray for keyboard backlighting (at least on the 13" and at least on the more expensive model - though that would seal the deal that I have to spend higher bucks. 4GB default RAM would be nice with 8GB upgrade.
CPU's will probably be 2537M (1.4GHz i5) for lower 11" and 2617M (1.5GHZ i7) for higher 11" (with 2657M 1.6GHZ as option). If we are lucky, it will be 2617M and 2657M, if we are luckier it will be a bump (i5: 1.7GHz and i7: 1.7GHz/1.8GHz - I don't know the numbers) above this that is not yet released though was rumored on this site. These eat 17W TDP (though include GPU so no extra there). This would mean they probably cannot bump battery life much on the 11" (6 hours max).
For the 13 inch I expect 2629M (2.1GHz) and 2649M (2.3GHz) which eats 25W. This also means they cannot bump battery life much (8 hours max) though they might surprise me and use 17W TDP here which means a nice bump in battery life at the expense of performance (10 hours). Apple would have a hard time explaining why the CPU clock went from 1.86GHz/2.13GHz to 1.4/1.5/1.6 (or even if they use the unreleased goods (1.7/1.8).
I would be fine with both outcomes.
Actually, I just looked up the TDP of the NVidia. 9400M was 12W. GT 320M is probably similar Core2Duo CPU in the 11" is 10W and the 13" is 17W. So TDP for CPU/GPU would go down 22W -> 17W on the 11" and 29W -> 25W on the 13" (assuming they use the 25W of which I am sure of reading this). Maybe the 6 and 8 hours will be 7 and 9.
My not overly unrealistic wish is a base 13" with backlit keyboard, 4GB RAM default (upgradable), 128GB SSD and any of the 25W TDP i7 CPU (only i7 is available now), 8+ hours of battery, Thunderbolt, of course. Then I only have to drop the cash on the cheaper model as I don't need more SSD, I can get my RAM upgrade on the base model, and the difference between the 2629M and 2649M CPU is just clock speed. It is not like the difference between the lower 13" Macbook Pro and the higher which is an i5 to i7 upgrade. The backlit keyboard is the stickler. There was one line of Macbook Pros (or aluminium Macbooks?) where the keyboard backlighting was upgrade option between the lower and higher models. PLEASE don't do that. That'll certainly force me to drop the extra cash.
If there is no keyboard backlighting, it is questionable if I will buy...