This spring, Diplo announced plans to form a DJ power couple with Skrillex called Jack U. We haven't heard too much from them since, but they presented a handful of new tracks at this weekend's Mad Decent Block Party in San Diego, Revolt.tv points out. Including one untitled new track with experimental soul/R&B duo AlunaGeorge. Check out the song, which starts at about 3:10, in a video shot at the Block Party:

Watch Diplo in a Pitchfork.tv documentary about the Warehouse Project, along with footage from Check Yo Ponytail in which Diplo makes a cameo during a Skrillex performance.