Deathwing pvp brutally raped and murdered.
"As announced in the devlog, Deathwing will be down for maintenance in order to upgrade the core on Wednesday, 23rd of March, at 7:00am server time."
This means that arena mmr system will be thrown out of the window and teams can only face other teams within 120 mmr of their mmr range. Mmr range will be static and it won't expand within time intervals. Only way to get a queue pop is to wait 10 minutes in queue and get paired up with the next team who joins arena queue. Basically higher mmr teams will always end up facing low geared teams who are doing their weekly caps at 1400-1600 mmr after waiting 10 minutes in queue.
Pushing out Lordaeron core on Deathwing with trinity cores default arena mmr system is a huge mistake. It doesn't work on Lordaeron with 10k players online, it surely as hell won't work on Deathwing with 3k players online.