Looks like Commonwealth, the "gastropub" owned by Hank's Oyster Bar's Jamie Leeds, is opening this Wednesday in the Highland Park building at 14th and Irving. The Washingtonian and the Washington Business Journal both have articles on it, and it sounds pretty solid - tasty sounding English pub food and a nice beer list. The Washingtonian piece has the menu and lots of photos. The entrees are a little pricey for me, but I bet they are quite good.
Here's their website. I'm looking forward to it. Stay tuned for a review once it opens.