I'm sure you have heard many of this type of response in this thread, but here's mine. If I were in charge to come up with DC sets for 2015, these would be them.
1) "Batman : vs. Killer Croc" - $12.99
. Batman (same as in the Riddler Chase) and Killer Croc
2) "Batman : Hush Encounter" - $19.99
. Batman (standard black variant), Hawkman, and Hush
3) "Superman : Brainiac Attack" - $29.99
. Superman (new 52), Lois Lane, and Brainiac
4) "Batman : Villian Showdown" - $49.99
. Batman (standard dark blue and grey), Green Lantern, Sinestro, and Two-Face (different version)
5) "Superman : Battle of Metropolis" - $69.99
. Superman (new 52), Batman (new 52), Martain Manhunter, Doomsday (big fig), Lex Luthor
Perhaps this is a tad unrealistic, I doubt they'd give us this many new heroes/villains in one wave. But oh well!