Overwatch's official EU Twitter account is teasing three arena maps in conjunction with the game's anniversary celebration starting on May 23.

The new maps appear to be parts of the existing Dorado (including what looks like Sombra's room), Eichenwalde, and Temple of Anubis maps.

[Source: Overwatch Twitter]

 

Our Take
I've been told (I'm certainly no expert) that 3v3 is a good possibility for these maps, but we'll just have to wait and see.