With all of the anticipation around I7, there is finally a light at the end of the tunnel. IT'S ON THE TEST SERVER! They have added a lot of way cool, nifty things. Obviously, the Mayhem Missions for villains is one, but a there are a lot of others also.
New base items are included, also for villains mainly, but heroes too if you have both. Also, if you have both (a trend here?), heroes will have access to villain costume pieces. There are several power adjustments, and a lot of PvP modifications too. Also a lot of new powers for villains as well as the 40+ content and zone for villains. Get the whole list here: Issue 7 Data