Born of a dissatisfaction with Homeworld 2, the Homeworld:@ team is building upon the foundations of Homeworld and Homeworld:Cataclysm to create a faithful sequel in the Homeworld:2 engine, with new ships, storyline, and game mechanics.
Current tech trees for the two playable factions. Open the "view original" link in a new window/tab to see in full size.
What is REP, TRN, and CNF?
Republic, Turanic, and Confederate. The currently playable Vaygr fleet plays host to some ships that don't belong in it for now until they have a fleet to call their own.
Note that the Turanics are unlikely to ever be a full playable faction, so enjoy them while they're buildable at all ;)