If its all going to be new silicon, I hope they'll focus on CAMM2 - both memory and motherboard makers.
CAMM2 vs DIMM vs SODIMM is just packaging, the silicon chips are the same. As long as the silicon stays unaffordable the rest doesn't really matter.
I'm hoping for MR-DIMM myself. A ram channel that has 2x, 4x, maybe more capacity than before would be most welcome. Assuming the day when ram isn't up 500%+++ and I can afford some.