The RSI site is taking it hard right now as there are tons of 504 and 502 errors due to heavy traffic.
If you can get in, here is what you might see
The Defender is live, the Mantis is live and the latest patch, 3.7, has gone live.
I wont even try to link the patch notes right now as the site is getting slammed and is mostly not responding.
But as soon as it settles down I will toss in some links.