Injustice: Stage Arena Discussion

Well, I looked all through the thread and there's no thread specifically about the arenas in Injustice. SO here it goes:

So far, these are the confirmed areas we're gonna fight in once the game comes out so far:

Metropolis (Regime Era)
Gotham City
Arkham Asylum
Fortress of Solitude
Justice League Watchtower
Atlantis Throne Room

Any suggestions on what other arenas might make the cut?

Arenas that made the cut via battle arena:

Wayne Mansion (2/21/13)
Insurgency Hideout (2/21/13)
Hall of Justice (2/28/13)
Iron Heights Penitentiary (3/15/13)
Ferris Airfield (3/15/13)
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