Pine Trail is the platform for the new Atom Pineview processor, which integrates the GPU with the CPU for a performance boost.
I doubt the performance boost will be that significant. Intel already "gave hints" that it will perform slightly lower than the ION platform (we assume they mean in 3D performance), however what would most likely make it special is slightly increased graphics, for a way lower total TDP of the system.
Pair the Pine Trail platform with a Pixel Qi screen, and we're talking about netbooks that might topple 10 or perhaps even 12 hours of battery life!
There should be 2Watts saved on screen backlight, and another 5 watts for the bridge/memory controller which are on chip, and the graphics which is made on a smaller die. Another few watts will be saved on lighter electronics, meaning a smaller, or lower rotating fan; or perhaps even a passive cooling system (which I hope not for netbooks).
Also a SSD could save upto 1 Watts on power, that's effectively reducing the power requirements of a system with 36%, or, results in 36% longer battery life (in case of the EeePc901 with a proclaimed '8 hours of battery life' that would result in almost 11 hours of battery life).
Most likely manufacturers will save on equipping the first models with smaller capacity batteries, when paying extra for the newer platform and screens, in order to keep the cheapest 9-10" netbooks for under $400.
So in the end you end up with a regular looking netbook, and standard battery life, only more expensive, but more 'green'.
I presume the second wave of netbooks with this Pine Trail platform, will support larger capacity batteries (6Cell), and perhaps SSD's, and have phenomenal battery life (close to the 11 hours will be technically possible).
As for performance, the CPU will still be an atom CPU. We'd be lucky if the bandwidth to the graphics card has increased a bit with the on chip crap-hics card!
Most likely Intel will burn a GMA900 series to GMA500 series graphics core on the CPU chip. I doubt they will equip the Atom with anything better. But if so, I bet the X3100 has a better chance than the X3000 seeing that the GPU is clocked at a lower frequency (400 VS 667Mhz),and thus save better battery.