We've got releases planned out,
RC1 - Will contain everything you get upto the radar being built
RC1:P1 - Will add in the country system for the sides that have units at the current tech level, and naval.
RC2: Will add in everything upto the tech centre, excluding the cloning vats, industrial plant, super weapons, and other advanced utility buildings that could cause major balance issues if implemented incorrectly.
RC2:P1: Will add in super weapons, all of them.... and also the advanced utility buildings, cloning vats, spysat etc.
RC3: Everything, polished and finished ^_^
Possible releases:
RC4: Single Player Campaign, Yuri's Army?
After that it'll just be balance updates and map packs.