I think most people knew it would be him but we've said in the past on here to not post spoilers for 24 hours. This time I've added it to the title
In any case, I can see a massive heel turn from him and in the coming weeks as well. He didn't say a word when he came out and wwe.com has posted clips of him backstage not saying a word either. This has all the hallmarks of a typical Jericho heel turn.
With a bit of luck we'll see him trying (and failing) to end the streak at WM - he's the only person I can see making it mean anything.