I still believe that we have YET to see a fully realized 3D CV game. I mean, CV 64 had some good things going for it, but despite the platforming goodness, it's just not what I'd expect a 3D CV to REALLY look like. Though, LoI/CoD aren't either. I think the PERFECT 3D CV experience would be something that takes the best features from both CV64/LoD and LoI/CoD, yet is something 5 notches UP!
When you move into 3D territory, you HAVE change it. You can't just apply classic 2D ideas to a 3D world. Especially with modern gamers. It has to be up there ENOUGH for the casual gamers(non-fans) to get into, while it has to retain enough goodness that us die-hards will LOVE! It has to be a fun experience.