BioWare - Mysterious Countdown on Bioware's Sites

According to GameBanshee, Bioware has put up a countdown on their homepage that expires on March 29th 2010 as well as all their game-related subsites. There's no hint as to what this countdown is actually counting down to, the clock is just silently ticking away.
As to what it is, your guess is a good as mine. I haven't a clue to what it is, but maybe you do? Or are willing to take a (wild) guess?