Here's a link: http://www.ncaa.com/news/basketball-men/article/2012-05-16/georgetown-host-east-regional
Technically Georgetown is the host (since they are the team that plays at the Verizon Center). I don't know that Maryland has a great chance to make the sweet 16 this coming year (or even if they did, if they would have any chance to be at the regional in DC), but it would be great if it happened.
FWIW, also included in the article:
Washington, D.C., will join Arlington, Texas, along with Indianapolis and Los Angeles as sites for the regional semifinals and finals from March 28-31. Dayton will host the First Four March 19 and 20 and is one of eight cities hosting second- and third-round games March 21-24. The others are Auburn Hills, Mich.; Austin, Texas; Kansas City, Mo.; Lexington, Ky.; Philadelphia; Salt Lake City; and San Jose. The Final Four will be held April 6 and 8 in Atlanta.
It's a young team but I'll hope for the best. Go Terps!