User blog comment:Derp2000/Tuesday's Blog: SPECIAL BLOG - THOUGHTS OF THE TRAILER OF THE TAKEN KING/@comment-24815825-20150617075854

In the ViDoc accessible via Destiny's mobile app, one of the devs (the first one, sorry I don't know his name) talks about Phobos, which the Cabal seem to be fleeing because of Oryx (we see some Cabal soldier being abducted in the footage). Yep, Phobos. Next subclass for titans : Sarge !

On the other hand, we have this screen of a Sunbreaker Titan showing his Mjol... hum... his hammer while being in what looks damn like the Lighthouse on Mercury.

So, my 2 glimmers : Mercury is our next social hub and Phobos (based on what that dev says) is our next battlefield.