Finally the beta is up again!

Blizzard post:

"The second phase of the StarCraft II: Wings of Liberty beta test is now underway. We're delighted to invite you back to the battlefield and hope that you will join us through July 19 for more terran, protoss, and zerg action. 

As stated previously, all data from beta phase one has been reset. This includes characters, match history, ladder rankings, and achievements. Beta participants will therefore need to recreate their characters and, if joining matchmaking games, complete a new series of placement matches. 

We thank you for all the feedback you provided during phase one and are excited to hear about more of your experiences in phase two. Welcome back to beta, and we'll see you on Battle.net!"

So nine days of playing time.

Patch 16 update:

"GENERAL
Rally points now behave as a move command, instead of an attack move command.Enabled the ability to manually add a StarCraft II character friend using the player’s character code. Character code is a server-assigned numerical code that is displayed within the Add Friend panel.Battle.net Achievements & Rewards have been updated.All Quick Match modes are now available: 1v1, 2v2, 3v3, 4v4, and Free For All.All A.I. difficulties are now available for play.Cooperative matchmaking versus A.I. players is now available as a play mode.Enabled cross-game social features between World of Warcraft and StarCraft II.The rally point change is the 

ZERG
Infestor
Frenzy spell removed.Infested Terran spell added.
Overseer
Infested Terran spell removed.
Ultralisk
Now immune to stuns and mind control."