We're working on creating a build that's not only stable, but ensures that alpha participants are able to fully test the latest Warlords content -- such as the Shadowmoon Valley Alliance quest and Garrison content, and the Tanaan Jungle introductory Draenor experience. That said, we don't currently expect that a new build will be ready for release today. Our goal remains to release a solid build as soon as possible, and we'll provide further updates once we have a more specific timeframe for bringing the alpha realms back online.
We can't wait to give you an early opportunity to step through the Dark Portal into Tanaan Jungle, and break ground on your Alliance Garrison in Shadowmoon Valley! Thank you for bearing with us during this time. :)