Earlier today, Mass Effect 3's executive producer, Casey Hudson, announced on twitter that Mass Effect 3 is officially gold. The game will be released on March 6th for North America, 8th and 9th for Australia and Europe respectively.
If you can't wait for the full game, a demo of the game will be released soon for the PC, PS3, and Xbox 360. It will feature a sneak peak of both the campaign and 4 player co-op. This is the first time multiplayer has been implemented in the Mass Effect series, players can control their own characters and take them on different missions on their own.
More news on Mass Effect 3 will probably be announced very soon. And if you've not watched the 5 new trailers, check them out on my other post. Oh and don't forget the tease, "Many surprises await you - this week and beyond."

