If it's anything like the Green Arrow or Swamp Thing deluxes it will be an omni in everything but the name. The lack of "Volume 1" seems to indicate this will collect their entire run together like those other N52 "Deluxe" editions. It's about 4 volumes worth (the fifth volume of Flash was written by Bucc, but not drawn by Manapul).
Gives me hope for Action Comics by Morrison and Aquaman by Johns to get the same treatment. WW may be too long. It's my guess for the first true N52 Omnibus (not counting the dumb sampler platter N52 omnis).