A flickr user, luiggi, posted some of the coming LEGO Super Heroes Mighty Micros minifigures. These minifigs will be appearing in the mighty micro sets in the spring of 2016.
Here are the sets they will be in:
Batman vs Catwoman (76061)
Robin vs Bane (76062)
The Flash vs Captain Cold (76063)
Spiderman vs Green Goblin (76064)
Captain America vs Red Skull (76065)
Hulk vs Ultron (76066)