As noted, Vince McMahon recently confirmed that John Cena, Bray Wyatt, Randy Orton and Seth Rollins will be returning from injuries in the next month or so and that the plan was to start with Cena on the Memorial Day RAW, May 30th.
Some of those other returns are penciled in for the week of June 6th, when WWE will be in Oklahoma. The idea is to use the buzz surrounding Cena’s return to have momentum when it’s time for the others to return.
Plans could always change but they are looking at Cena coming back first. As noted, Wyatt isn’t expected to wrestle for a few more weeks once he’s brought back to TV.