It has since been clarified that the reports of his discussions with WWE were largely exaggerated in the first place, likely for click-bait purposes. Mysterio himself was never all that interested in WWE, and had his eye on GFW because of the easier schedule. As it stands, Mysterio is not committed to any major promotion and is said to be focused on training his son Dominick as he prepares to embark on a pro wrestling career.
Apparently, GFW wanted Rey and Alberto el Patron to work together at the Bound For Glory pay-per-view in November. It was recently reported that a Jeff Jarrett vs. el Patron match was being planned for that event before Jarrett announced a leave of absence. The plan was to tease that match, with el Patron blaming Jarrett for being stripped of the title and suspended, and then have Jarrett surprise everyone by introducing Mysterio as his real opponent. However, when talks with Rey fell through, the Jarrett-el Patron angle was then intended to go ahead as advertised. Now, of course, even that has fallen through and there is no word on what the plans for el Patron are at this point.
The Observer also said that Rey suffered an ankle injury at an event for the Catch Wrestling promotion in Austria. The injury occurred during an eight-man single elimination tournament that took place in four cities from August 30th through to September 2nd. The injury is said to have not been too serious and he is expected to be performing again before long.
PWInsider reports that Alberto el Patron has 6-8 months left on his contract with GFW. As noted above, Bound For Glory plans keep falling apart for el Patron and there is some speculation about whether anything will materialize or if he might end up parting ways with the company.