That just means he will leave after the next season.
Come guys, wake up. That's a classic Mourinho move. He always signs new contracts before leaving. Obvious exceptions being Porto and first Chelsea stint (maybe, not sure), since he was not so high-profile back then. And had not worked up this little money-extortion scheme.
He signed new contract at Inter in 2009, until 2012, he left in 2010 for Real. He signed his second contract there in 2012, gone in 2013. Goes to Chelsea signs an initial contract in 2013, then a new one in 2015. Gone the same year, but that was because he was fired due to catastrophic results. He wanted to create a toxic atmosphere so that he could go in 2016 according with his scheme, but kind of overdid it i think.
Honestly the guy has done it three times in a row now, i find it extremely funny that some people fail to see this. Or regard this as a coincidence. Clearly the guy knows, that the new contract allows him, well his agent, to negotiate more inflated wages in the new place, also allowing him to collect his golden parachutes on the way.