It's available now in the App Store and it's HUGE (about 800 MB). In addition to a few new drummers (about 5 GB of new content) and a ton of fixes (and long requested workflow options), there is a gorgeous new interface + new processing options (ex. stereo left, right, middle or side signals only) for the channel/linear EQ that I hope will carry over to Logic's other stock plugins. It's nice to see the audio team at Apple has made good on their promise to provide a continuous stream of updates and additions. For a breakdown of the update go here.