WWE is apparently not saying anything regarding Rey Mysterio. The word going around is that everything regarding Mysterio is being kept quiet on both sides.
As noted a few weeks ago, WWE originally had a script put together for Mysterio to do a storyline that was scheduled to begin at the Survivor Series pay-per-view and end at WrestleMania, but the feeling was he was on his way out of the company at that point, so they decided against it.
As things stand now, the Mysterio storyline has been completely dropped and there are no plans for him to be brought back in the sense that the WWE creative team has been told not to worry about coming up with any ideas or plans for him.
(Credit: Wrestling Observer Newsletter)