"On 05/16/13, starting at 00:30 PDT, ranked queues will be disabled in preparation for patch 3.7. At 02:00 PDT, the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 6 hours"
The patch should contain the five TPA skins and all the balance changes we've been seeing on the PBE over the last week or two. Expect official patch notes soon.
P.S: Before anyone even asks, Aartox is not in this patch.