I know a few people were playing it, including me. From the web site:
"We want to thank all of the fans who participated in the closed beta of Star Wars: Attack Squadrons.
After much consideration, we have decided to cease development so that we can focus on other
Star Wars game experiences. We truly appreciate the time you spent engaging in the beta."
Kind of sad, but the game was hard to play - Nothing like the LucasArts X-Wing/TIE Fighter/Alliance games of old. Maybe something better will come along.