It appears that along with the last update patch, came news of a new World Event, 1.7 Return of the Gree, that we'll see with the next minor release. In case you aren't aware, you might want to go check it out. The main thing you probably want to be aware of is that you'll really want to have a level 50 character ready for this event. Its focused on Ilum and of course the ancient Gree.
Unfortunately, for those like me, spending most my time under the cap it doesn't sound like it will provide as much significance. I have a level 48 I might push up to 50, but mostly I've moved on to another character.
In addition this release will introduce the new Reputation system. It also seems focused on the high level end of the gameplay, so thats where you'll want to be to get a chance to start experiencing this new game mechanic as well.
So, if really want to enjoy this next release, I encourage you to get leveling if you aren't already near the cap!