These are my predictions...
RAW:
Triple H and Booker are real-life friends. Infact, Booker didn't want to move to RAW because of the back-stage politics, but it was actually Triple H who inspired the move. Triple H and Batista are good friends, and they had a memorable feud. I'm calling King Booker vs Triple H at Mania 24. For the title? Probably not. I've heard Orton has really been behaving himself backstage since the hotel trashing incident. If that continues, I see a WWE title match in Orton vs Cena. It's inevitable.
By that time, I predict CM Punk will have already conquered ECW as champion, thus getting called up to RAW. I see him as an acquisition to the Intercontinental scene, feuding with the likes of Jeff Hardy, Umaga, Carlito, etc. Although, I still see Umaga holding the IC Title for a lengthy period. As for Money in the Bank, I suspect they will do another 8-man next year. A few of the wrestlers I predict for that match are Jeff Hardy, Umaga and Punk.
Smackdown!
I'm calling for Edge to hold the title up until Wrestlemania next year. He was a transitional champion twice before and he's paid his dues. He has earned his spot to carry the Smackdown brand and put Batista on the shelf for now. I predict Edge to not only retain his gold, but his gimmick as "The Ultimate Opportunist" as well; defending his title against monsters like Mark Henry and Khali, in-between Batista's feuds with them. I see Edge dropping the title to Undertaker at Wrestlemania 24, hopefully in a stipulation match.
I also predict MVP to dominate the mid-card scene, holding the US title for a good run. When Mysterio returns, I predict a feud with MVP. I can also see Chavo Guerrero getting a push from Cruiserweight to feud with MVP for the US Title, because Chavo is well over with the fans.
I can really see Chris Masters getting a big push on Smackdown. The head writer is said to be fond of him, and he's getting a fresh start from his stale run on RAW. Masters is another canditate to feud with Mysterio.
ECW:
Who will be ECW Champion come Wrestlemania 24? I have to think they've invested a lot in Johnny Nitro to carry the brand. Perhaps they will move another veteran to fill the void left by Benoit and feud with Nitro? Despite rumours of him returning to Smackdown, I have a sneaking suspicion that Mysterio might jump ship to ECW to carry the brand as champion. He is an ECW original and has enough experience for the young talent on ECW to gain knowledge from. They gave Nitro an unnecessary, sudden push and they will regret this with declining ratings. Ratings are already miniscule as it is. They need star power like Rey Mysterio, and I think he is a top candidate with his return approaching.
Also, there has been talk of bringing in ECW Tag Titles for months now. You'd have to think that by Mania next year, they'd be set. Hopefully they inaugurate a tag division to spark up the brand. But from the looks of it now, nothing is really shaping up, as the Major brothers just moved to Smackdown.