Riot has now put Howling Abyss on the PBE which is a reworked model of the current ARAM map.
http://na.leagueoflegends.com/board/...4#post35633434
I'm super excited that they've finally added a Q to ARAM. Currently it's only all random, but hopefully they may add a blind pick as well, since blind pick proving grounds is fairly popular too.