I believe this is at the south end of the Wharf development between M and P Streets SW along the Washington Channel of the Potomac.The Anacostia Riverwalk Trail will use the Promenade in the front and a trail currently is on the east side of this plot from the Titanic Memorial at O, past the Thomas Law House, to 6th Street. It looks like that will remain.
According to SWLQTC, a building permit was just issued for this.
park elements include plantings, pergolas, a water feature, play mounds, pathways, seating areas, an access road for the Harbor Patrol, and a plaza. The plaza will be named after DC Delegate Eleanor Holmes Norton - the section of the park between the access road and the Wharf promenade.Construction on Waterfront Park should begin later this year and should last about 11 months, with delivery scheduled sometime in 2016 after the new church/condo buildings are complete.