StarCraft: Subjection is a fully voice-acted 8 mission singleplayer campaign for StarCraft II: Wings of Liberty that features four difficulty levels. Search for the keyword "Subjection" on the North American server on Battle.net.

Release Trailer:

Full-Length Machinima:

Screenshots:

The SC:L Staff has developed a brand new custom map called Room Wars. It is a custom map for StarCraft II that can be played from 2 to 8 players in Free-For-All or in team matchups. The map is similar to a Zone Control map with the exception that each zone is enclosed in a room and the room’s doors open at different consistent times. It is very fast-paced as players can quickly lose the game if they don’t protect their captured rooms.

This map can be played at all levels of skill but it gets progressively harder as players control more rooms. This would require more attention to micro units as some units are dependent on their abilities.

The map has 48 rooms. A general rule of thumb is that the farther the room is from your initial room, the better spawn it will have. Thus, the rooms close to the center will have the best spawn.
This map can be played on different modes:

• Classic Mode (FFA): In this mode, players will have to capture and control 40 rooms to win.
• Classic Mode (Teams): In teams of 2, players have to jointly capture and control 40 rooms.
• King of the Hill: Players need to capture the center room for 5 minutes.
• Resource Mode (Under Development): Capturing rooms grant players periodic resources and supply with which they can use to warp in a variety of units to any of their controlled points. Teams must capture 40 rooms to win.

The map is currently available on US, EU and LA servers by the name [SCL] Room Wars.

The StarCraft 2 custom maps platfrom "Arcade" beta is now live. In order to participate on the Arcade Beta, you will only need an active Battle.net account. Download the Beta client through your battle.net account and start playing some custom maps in this new platform.

The Patch 1.5.0 Beta introduces an entirely new Battle.net experience: the Arcade. The Arcade offers exciting new ways to find and play your favorite custom games -- and discover new favorites too -- with the option to search for games based on categories including genre, star ratings, release date, and more. After you’ve found a game that you’re interested in, the new Game Info page will provide you with all the information you need to know before you dive in, including a description, screenshots, instructions, patch notes, tutorials, as well as star ratings and reviews provided by your fellow players. The Open Games list will help keep wait times down by displaying games that are waiting for players too.

Blizzard will support their mapping and modding community through "Arcade" which will improve the distribution of custom games in StarCraft 2.

Source:
Battle.net - The Patch 1.5.0 Arcade Beta Has Begun
Battle.net - Arcade Beta Forums

Blizzard has officially released the long-awaited awaited mods along with new achievements and portraits.  

Maybe you’ve already had a chance to experience our official Aiur Chef, Left 2 Die, and StarJeweled mods while they were in beta, but even if you have, you’ll definitely want to check them out again: the final release versions have just been published. Each mod has been polished with improvements and bug fixes, plus they now feature official achievements complete with brand-new avatars to unlock!

Eager to get into the action? It’s easy to get started -- just jump into StarCraft II and hit the Featured section of the Join Game interface to start a match! You can find all three mods featured on the StarCraft II community site’s Maps and Mods page, where you can also check out great map making tutorials to teach you the techniques it takes to create your own mod masterpieces.

Official Mods Achievements

Aiur Chef

Executor Chef - Cook at least one of each dish in all three rounds of one game of Aiur Chef.

Virtuoso -Win a game of Aiur Chef. Awards Zealot Chef portrait.

Supreme Cuisine - Score over 2000 points in a game of Aiur Chef.

The Heat Is On - Kill another zealot chef when hit by the Great Equalizer.

Allez Cuisine! - Cook two dishes within 30 seconds of each other.

 

Left 2 Die

Live and Let Die - Complete the "Left 2 Die" scenario on Normal difficulty.

Please Hammer, Don't Hurt 'Em - Kill a Stank before it kills anything on Hard difficulty. Awards Stank portrait.

Die Another Day - Complete the "Left 2 Die" scenario on Hard difficulty.

Here Comes the Hammer - Complete the "Left 2 Die" scenario before the fifth night on Brutal difficulty.

License to Kill - Complete the "Left 2 Die" scenario on Brutal difficulty.

Night Of The Living - Survive 5 Infested Horde Attacks in the "Night 2 Die" mode of the "Left 2 Die" scenario.

Night Of The Living II - Survive 10 Infested Horde Attacks in the "Night 2 Die" mode of the "Left 2 Die" scenario.

Night Of The Living III - Survive 15 Infested Horde Attacks in the "Night 2 Die" mode of the "Left 2 Die" scenario.

 

StarJeweled

Tag Team - Win a 2v2 game of 'StarJeweled' with no A.I. players.

Jewel Crafter - Win a 1v1 game of 'StarJeweled' against a Medium A.I. opponent.

Jewel Star - Win a 1v1 game of 'StarJeweled' against a Hard A.I. opponent.

Jewel Super Star - Win a 1v1 game of 'StarJeweled' against a Very Hard A.I. opponent.

Jewel Rock Star - Win a 1v1 game of 'StarJeweled' against an Insane A.I. opponent.

Jewel of Denial - Heal 3000 points of damage in a game of 'StarJeweled' using the Healing Wave ability.Awards Ornatus portrait.

World of Orecraft - Do a 6 combo gem break and receive "For the Swarm" notification in a game of 'StarJeweled'.