I think the new Kane character is just what Glen Jacobs needs after being stuck so long in the same concrete upper mid card role. I hope that WWE just doesn't feed him to Cena and leave him to gather dust in the same upper mid card position when they've got an intriguing and genuinely quite scary character! The trouble is...
Kane and Cena will have a match where Kane will dominate throughout and win the match. The following weeks will be all about Cena gathering momentum for the rematch where Cena will overcome the odds and take the win - leading into his match with The Rock at Wrestlemania. The entire program will do nothing for Kane if it goes this way because everyone knows that Cena needs to go into Wrestlemania strong. The only way that WWE thinks they can do this is by having Cena defeat Kane clean and perhaps even dominate him.
Here's how I'd book it...
Kane and Cena have a match where Kane dominates and takes the win by stoppage after he applies his new choke submission. The key here being "stoppage", since Cena doesn't quit, his refusal to give up will make Kane look like a killer and keep the Cena character true to it's roots. The following weeks will revolve around Cena trying to get his momentum back and finding a way to conquer Kane. Cena will insinuate that he cannot pin or submit Kane and that the only way he can overcome the monster is to pull out all the stops - a last man standing match. Cena will win this match in some fashion, perhaps similar to how Chris Jericho defeated Kane at Armageddon 2000.
There isn't much difference in the predictable WWE booking and mine, but mine serves to make Kane look unstoppable, whilst preserving the Cena character. Since Kane won't be defeated conventially, they could carry on an undefeated streak for months - unless Kane is matched against Undertaker at Wrestlemania of course. Following the series with Cena, Kane could go on to match or even best his Royal Rumble elimination record before being eliminated by the person that WWE has chosen for Kane to face at Wrestlemania.
Of course, WWE could actually TURN John Cena heel by aligning him with Kane. The chances of this happening are pretty slim...