The Splash Damage team of programmers expressed the will to release the final 1.5 patch with no help from Activision, the publisher. Because of that, the beta is likely to last longer.
Under normal circumstances, a team of Activision people should join forces with programmers from Splash Damage, and help them in looking for bugs. However, due to some game-licensing issues, Activision decided not to support Quake Wars, so a small team from Splash Damage decided to continue working on game development.
Open beta started in late February, and the final version should see the light of day by the end of April. However, they couldn't officially confirm the date.