I know there hasn't been a official release date from the developer, but I found this interesting.
They are saying April 12th for Brink in "actual release dates" section but they also have Mortal Kombat on the same side without a date.
They also have a "seasonal releases" section (no dates) with games like Mass Effect 3 that have a "Coming Holiday 2011" release time frame. Which is smaller window than Spring 2011.
I wonder how they came up with this, or if they even check on these things.
Check it out. http://pc.ign.com/articles/114/1140196p1.html