Nothing revolutionary, the Atom will get some slightly less power hungry chipsets that should also improve HD video playback, and you should start to see more Nano based units that seem to have a tad more cpu power (plus 64-bit, 4gb ram max) over the atom.
There is also rumor of a wave of ARM powered netbooks coming, but if X86 windows is your bag then they probably won't interest you.
There is a nano based samsung NC20 which has just been released, is meant to be excellent, its 12" screen so a little larger than most but on the plus side the resolution and keyboard size is a lot better.