On Cryptic Studios' official website a counter has been put up. It has 45 days on the clock and is counting backwards.
Expect Cryptic to launch the official site for Star Trek Online on that day (July 28). There have been suggestions that the image used as the background to the counter come directly from Perpetual Entertainment's work on the same title, which Cryptic would have picked up if they took the art when they (as is rumoured) picked up the STO license several months ago.
EDIT: I really should include a link to the original artwork (down a bit, just before the two big pictures).