Although there were reports last week claiming that Rey Mysterio signed a new deal, Dave Meltzer reported today that those reports are false and he has not signed yet.
The talks are going well and things are close enough that they are talking about his remaining commitments. Rey is booked for All In on September 1st and he wants to do the show since he is advertised. Obviously, WWE would rather him not appear on that show.
He is the current Heavyweight Champion for The Crash promotion in Mexico so he would need to drop that title soon, probably to Bestia 666.
As noted here several times, Rey wants a lighter schedule because he wants to spend time with his family and he wants to train his son Dominik.
Rey is scheduled to be at Florida Supercon this weekend: