Graziano Delrio, Minister of Infrastructure and Transport, says Renzi will resign

I won't believe it until I hear it from Renzi himself after the vote.

But he recently told a radio host, "If I have to stay on in parliament and do what everyone else has done before me, that is, to scrape by and just float there, that does not suit me."

He's young, so it's not like he needs to cling to power in the short term. Resigning might put him in a better position down the road.