Just surprised I haven't seen any discussions about the updated Rebellion feature list. From the Sins facebook page yesterday.
If you are looking for some more features of Rebellion, Yarlen has posted a new short list:
•12 all new ships
•2 new structures
•6 new tech trees
•6 new factions (subfactions of the original 3)
•New victory conditions (including updated Diplomatic Victory condition)
•New scenario maps
•Updated capital ship balance and level 4 abilities for each
•Improved AI
•Updated Galaxy Forge w/trigger system for more interesting map designs
•Updated graphics w/shadows, in-game anisotropic filtering, many new updated particle fx, skyboxes and more
•Plus a bunch of other stuff
So, seems we know 9 of the new ships (6 titans, one for each subfaction, and 3 capitalships, one per race), but that still leaves 1 new ship per race unaccounted for. Corvettes have perhaps been cut, but I really didn't care for them much anyways. Two new structures I'm assuming is per race, and besides a possible titan factory I don't think we have any info on that either.
The six new tech trees is obviously 1 per subfaction. I wish we could get a confirmed capture the flag/king of the hill mode, as I think most people would prefer that to an improved diplomatic victory.
The new Scenario maps probably will just be standard new maps, but the updated galaxy forge with trigger system suggest they could also be sort of special missions, though not an interrelated campaign. The triggers are truly a huge feature, even just a basic spawn fleet or declare victory trigger would make all sorts of interesting "player campaigns" possible.
The improved AI could also be a very big deal, but that's still so vague that no one should be excited at this point.
And lastly some more concrete graphics components. Shadows and new skyboxes sound awesome, not sure what anisotropic filtering is but I don't think they've talked about it before.