The beta will shut down at 12:01am GMT on February 18, which translates to 7:01pm EST / 6:01pm CST / 4:01pm PST on February 17, better known as today. nope
"We would like to thank everyone for participating in Relic's most successful Beta ever," the developer wrote on the game's community site. "We've identified and fixed a tremendous number of bugs and balance tweaks that will make the game considerably better when it ships to stores this week. We literally couldn't have done it without you."
A number of statistics from the nearly month-long beta of the action-RTS were provided, such as the most popular heroes and most successful races, viewable here.