I'm thinking that the next expansion will take place out of our solar system. If anyone noticed the screen where you choose your missions while orbiting whatever planet you've been to most recently, it now says something along the lines of "Milky Way, Local Group" which was never there before the expansion. I think this was added as a hint that the next Destiny expansions will take place out of our Solar System, which makes going to the home world of the Cabal Empire an even more feasible idea. Just a thought, but I figured that it was interesting that they would specify which Galaxy and Solar System that we're in when the Taken King came out