Universal Champion: Seth Rollins

My guess before would have been Braun Strowman, who I fingered to win the Royal Rumble after a record-tying performance at Survivor Series (and the record he tied being Roman Reigns'). However, Strowman's future is now up in the air. He's on the shelf with an injury, and though seemingly minor, his title shot appears to be against Brock Lesnar at the Royal Rumble, not WrestleMania, which should send up a red flag. It seems unlikely that WWE would want the Beast to fall elsewhere, and Strowman's performance against him doesn't inspire confidence.
Seth Rollins' name has emerged as a potential competitor. It's a blockbuster match and the crowd will be firmly on the Architect's side. A loss of his Intercontinental Championship to Dean Ambrose beforehand could also put Rollins in a bad place mentally, giving him another obstacle to overcome.
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It's the perfect recipe for a WrestleMania match. I'll be optimistic that it will happen and that Rollins will cap off an incredible year there.