No release date yet, but Fantasy Flight Games has posted some information about Cosmic Incursion, the first expansion for the 2008 edition of the game.
No huge surprises so far: 20 aliens and pieces for a sixth player were very much expected; reward decks and "cosmic quakes" sound pretty interesting.
Suggested retail is $24.95. That sounds about right, from what I'm seeing. Hell, that cover is worth $10 all on its own.