Update - Added today's few blue posts. Sadly, nothing really new/exciting and no news of Patch 4.3 yet.
Update - Added Patch 4.2.0A Official Notes
Patch 4.2.0a deployed on live realms
Patch 4.2.0a has been deployed on live realms and your game build should now be 14480. We're not really sure what bugs are fixed with this patch, hopefully we'll get official notes at some point.
Originally Posted by Blizzard Entertainment