The current World Heavyweight Championship belt, dubbed by the fans as "The Big Gold Belt" should stay the same. That belt's too synonymous with that championship. The ECW title has a great design to it, especially since it is silver, but it could use a BIT more color in it and a size shift. The plate is so huge it makes wrestlers look like they've got a vest around their waists practically. There's no need for Chris Jericho and Big Show to carry around two tag team championships anymore. It's been long enough that they can TRULY unify the titles and just have one. As far as the IC and US titles go...I'm fine with keeping them the same, even though I'd LOVE to see the old squared off IC title come back just for nostalgia purposes, but right now the IC title is my favorite out of all the designs they currently are running with.
That is, of course, if the goal is to just redesign the belts. They might introduce a new championship altogether - which they don't need to do. They barely have enough people to scrounge together to challenge for the titles as it is, and if they introduce a new one, it'll screw it all up.