Looks like there's a groundbreaking ceremony today at 2 pm with the mayor for the new Justice Park, to be located in an empty lot on Euclid Street just west of 14th (here's the location).
It's going to replace the current Justice Park located across the street and behind the BP gas station, which is apparently going to be redeveloped into housing -- a person from DPR said the District made a land-swap but wasn't sure of the type of housing.
I think the old park is a big loss, as the new park will have 40 community garden spots and the old park was closed and wasn't very welcoming -- it was above ground behind a big wall, and seemed to be locked. Plus from the looks of it, it was kind of bleak. The new park should be done by Spring 2010.
The new park has a Twitter, which is cool, and here's more about it. Here's the website from DPR for it, including the plan.