Rey Mysterio has officially signed with WWE, according to PWInsider.
After months of negotiations since his return at the Royal Rumble in January, Mysterio has officially signed a two year contract with WWE. PWInsider says that he tried to negotiate an 18 month deal, but WWE wanted a two year deal. However, Mysterio reportedly has a clause in the contract that would allow him to give his notice at the 18 month mark.
His return should be imminent, as soon as WWE has a storyline for him.