Looks like there will be no improvement in battery life over the current MBP line. The TDP of 35 watts+ on the i5 or i7 processors plus whatever TDP is produced by the new dedicated GPUs will mean that battery life will not improve unless Apple comes up with some new clever way to pack more watts in the same size or smaller battery.
Most likely the idle / light usage battery life will increase, and the under load battery life will decrease. I'm not including video decode under "heavy load" there, as the GPU can offload that very efficiently these days.
The 35W TDP includes the Intel graphics remember - and they will be disabled when the discrete graphics are enabled. That could be worth 5W under load.
Also the newer GPUs have lower idle power usage, and need to get to peak usage far less often, especially in normal desktop use.
I would hardly call a dual core Arrandale a ground breaking performance increase as it may be about 30% faster at 2.66Ghz compared to the current high end 3.06 GHZ C2D offering in MBP.
That's a good improvement between CPU generations.
I also want too see a 1680x1050 resolution on the 15" MBP and at least the option to forgo the optical drive in favor of a second HD or extended battery.
Higher resolution options make sense to me as well. I wonder if Apple will move to 16:9 screens with this refresh, or keep the 16:10. You could see a 1440x810 13" display instead of 1280x800, for example. The 15" could have 1600x900. Keeping the vertical pixel count is important IMO.