AAA will sign him up or he can keep running shows on his own (they're not drawing too well at the moment though), CMLL won't pick him up again. These dudes put Vince to shame when it comes to holding grudges, like Vince will forgive everything if you can draw some money, CMLL won't bring anyone who left for another company back, even if he's a huge name. They have a new Mistico at the moment too.
He's been using the Sin Cara name on shows in Mexico and gave an interview where he said he's allowed to use the name so I don't know what's going on there, WWE never usually let guys own gimmicks/names they've created.