Players are asked to focus on endgame content to give a clear picture of how well the new sets are performing, whether or not they’re fun to play, and so forth. There are also vendors to get your characters equipped in a jiffy, so don’t worry about catching up; just make a new character with one of the power sets being tested and go to town. If you’re a dedicated fan of the game, it’s a good time to get in there and make sure that the revamped sets feel fun to play for the future.
Source: Official Site