Well a new (sort of) map is going to be coming in the next few patches, possibly the very next one. If any of you have done the tutorials for LoL, then you've played on The Proving Grounds as Ashe (just a really long bridge). They've decided to allow its use for custom games!
Similar to Dominion mode you'll start off at level 3 and naturally gain a large amount of XP and gold, health relics also spawn at positions on the map, recalling is disabled, specific items are enabled/disabled. The map has been visually touched up a bit as well as added objects (towers and inhibitors), also worth noting that the platform does not heal and you cannot buy items once you have left the base until you have died again (still has the laser from SR though). Currently playable on the PBE if anyone is too curious to wait for its debut on the live servers.
Also coming in the patch will be a bunch of re-done portraits/art for a large group of champions and a slightly new way of choosing Summoner Spells.