The first phase of the StarCraft II: Wings of Liberty beta will come to an end on Monday, 31st May.
Several weeks will pass while Blizzard makes hardware and software changes. The beta will then be resurrected a couple of weeks prior to the game's full release on 27th July.
"We'd like to thank all of our beta-test participants for your enthusiasm, dedication, and valuable feedback during the beta test," wrote Blizzard on the game's forum.