A few hours ago, Blizzard has announced that the new SC2 Patch 1.2.1 is now live on the Public Test Realm. In its better part it deals with bugs and other issue but will also provide a sneak peak to the new ladder maps that are a subject for testing.

StarCraft II PTR Patch 1.2.1 Notes

General

* A special sneak peek at new ladder maps is now available!
* Matchmaking has been updated to better match players queuing with pre-made teams in 2v2, 3v3, and 4v4 brackets.

Bug Fixes

General

* Fixed an issue where the title of a conversation window was scaling rather than truncating.
* Fixed an issue where the Match History score screen was displaying "Null" for the map info for all games played before Patch 1.2.
* Fixed an issue that would sometimes cause players to be improperly disconnected from a game.
* Mac) Fixed an issue that would cause the Control key to become stuck when holding Control and minimizing the game window, then going back to the game window and attempting to use Control+1 to create a control group.

Maps

* Fixed an issue with foliage that would die and become visible through the fog of war when a player spawned as zerg.

StarCraft II Editor

* Fixed an issue where copied-and-pasted units were not set to the correct height in-game.
* Fixed an issue where the table view scroll-bar position was reset when switching objects.
* Fixed an issue where secondary sort priorities were not working properly. Model name is now the secondary sort so that models are listed in alphabetical order after being sorted by the mod they are contained in.

Furthermore, you can take a look of the new maps here.

Links
Battle.net - Source

New ladder maps on PTR 1.2.1