I would not make it a surprise. Actually, I'd do the exact opposite and hype the shit out of Cena. I'd have all sorts of promos about how great he is, all the challenges he's overcome, all about the hustle, loyalty and respect. Kinda like a Rocky Balboa montage... The fans and everyone on the announce team would hate it. The crowd would boo, chant "TNA! TNA! TNA!", everyone in the back would be like, "Gimme a break!" Interview all the wrestlers and ask them how they feel, "I would break John Cena, show him how it is here in the big leagues. We don't cater to children here Cena, you're not superman anymore." - Shit like that.
I would hype him so much, the fans would get sick of it. Kurt Angle, being the current champion, would basically call Cena out at the next pay per view (doesn't matter which one) saying he won't show his face because he's scared TNA will tear his ass apart. Fast forward. The ppv starts. All the matches go as planned except for the fact that they keep playing John Cena promos non stop. In the back, after every match, the winning opponent is asked "What do you think is going to happen tonight? Who will win between Angle and Cena?" The wrestlers are sick of being asked about John Cena, they all scream about how much they loathe him and how they can't wait to show him a "warm welcome" here in TNA. The main event starts. Kurt Angle comes out and starts pacing back and forth in the ring. Minutes go by. Angle is fuming, "C'mon Cena! Get your ass out here!". Cena's music hits, but no Cena. Kurt Angle is absolutely furious. We get camera shots of the locker room walking away from they're TV's completely pissed off, like they're going to find him. Back to the ring, the music stops. Angle is freaking out, yanking on the ring ropes, screaming for Cena. Out of no where, the crowd goes ballistic and Cena comes in behind Angle. The Match starts...
Angle and John start exchanging wild right hands, back and forth, with Cena getting the upperhand. People in the audience are going insane. Cheering, but mostly boo's and all sorts of John Cena hate chants with a little "TNA! TNA! TNA!" going on - They're all on their feet. The announce team can't follow the action fast enough and they're screaming over their head sets. Cena throws Angle to the outside and they start exchanging again, one getting the better of the other. They throw each other into the railing, tossing ring steps, pushing camera men out of the way furiously. Back in the ring Angle hits a couple germans, but Cena reverses the third into the STF. Angle grabs the ropes and the ref counts very quickly to 4. That totally pisses Cena off and he hits the ref with an attitude adjustment out of the ring, but receives a massive angle slam for turning his back. Angle applies the ankle lock but Cena kicks him clear out of the ring. John goes to follow Kurt but gets hit with a chair for his troubles, and is tossed back in the ring. Kurt wails on Cena with the chair and out comes the locker room, each one hitting their finisher on Cena in between chair shots. The ppv goes off the air with Cena bloody and destroyed and Angle telling him, "If you want my title... if you want to survive here in TNA, you're gonna have to earn it!!!"