I think it's possible Henry and Cena's feud continues into Summerslam. The feud has the potential to escalate into something personal enough to last two PPV main events. Bryan could cash in at Night Of Champions the following month against Cena, which would be appropriate given the PPV name.
However, I also believe they're gonna hold off on Bryan winning the WWE Title till Wrestlemania XXX. I would prefer this because when's the last time we had a true emotional Wrestlemania journey we could get invested in, where someone's quest to become champion for the first time finally culminates at Wrestlemania? Shawn Michaels, Steve Austin, Chris Benoit, Batista, John Cena and Rey Mysterio all rose to world championship-prominence at Wrestlemania.
We could have had one with Ryback this year if they had kept the title on Punk all the way till Wrestlemania and had Ryback win the Rumble to finally get his rematch against Punk (drop Ryback from the main event scene after HIAC) and then Ryback leaves wearing the title. Not saying I'd want to see that, but the story for it was there if they had wanted to take that route. They could have even booked HIAC as a draw so that they could keep Ryback's streak and also play up the fact that Ryback is the one guy that Punk has thus far slipped away from with the title but still never actually beaten.
Anyway, I'd love to save that magical moment of Daniel Bryan winning the title for Wrestlemania XXX. Imagine Bryan laying the title on the mat as his feet while he stands or kneels down (guess the title would be at his knees then) and throws his arms in the air in his usual pose while a stadium of people chant YES in regards to him finally winning the big one. Would be ironic considering it's ten years in the making since another guy who people said was too small to win a world title did so (count Eddie Guerrero in there too, since the show ended with him and Benoit with each other.)