Rejoice and sound the feasting horn! OK, I’m a few days late, but I just downloaded it yesterday and it is so damn cool.
The new expansion pack for Galactic Civilizations 2 has, among lots of other things:
New, race specific tech trees
Revised, better looking graphics that use less system resources
Vastly faster load times
Immense galaxy size (24 x 24 sectors)
Terror Stars
Modding tools
I cannot accurately describe how much more awesome this game has become.