I don't "expect" anything from any player, but I do think he will be as good as he was last year.
He controlled the strike zone exceptionally well, his BABIP against wasn't low, and he induced groundballs. He showed psychological maturation as the year went on, developed a ridiculous sinker, and is going into the season with Russell Martin as his catcher.
I don't think it will be very easy for hitters to adjust to Stroman, and I do think he will be every bit as good as he was last year, if not better.