The March 2, 2015 edition of the OPDX Bulletin edited by Tedd Mirgilotta KB8NW states the following:
"NA-079. Mike, WA0SPG, who will be on his first DXpedition, will be active as WA0SPG/4 from the Dry Tortugas between May 4-6th. Activity will be on the HF bands using CW and SSB. Equipment will be a KX3 and a FT-817 into a buddipole vertical dipole near saltwater, Alpha vertical and Loop antenna. Mike will also be on the satellite using 2x FT-817's for SO-50 and FO-29 (CW/SSB) with both arrow and elk antennas. All power will be by Goal Zero batteries being charged by Solar PV panels. QSL via his home callsign."
The OPDX Bulletin can be read every Sunday on http://wwww.papays.com/opdx.html
EL84 is one of the grids that is needed for the 488 Continental USA Gridmasters Award offered by the Star Comm Group (http://starcommgroup.org/index.html) hosted by Rick WA4NVM and Damon WA4HFN.
The last operation from the Dry Tortugas was by K4T back in 2010. You can read about it at http://www.papays.com/sat/k4t.html
This one is a little more rare than DM03, but only if you don't have it confirmed! 73, John K8YSE