From what I understand, you don't want extremely high-poly for game development. A complaint regarding CC characters has actually been that they have too many polys for game design.
With CC3 you will be able to generate different LOD version of the same character to accommodate game developers (although this is also useful for filmmakers). Also, note that a lot of the detail in characters can be accomplished with high-quality textures.
A standard version of CC3 is included in iClone, but to import and export you need CC3 Pipeline, which is a standalone program. The benefit is that it allows import of DAZ G8 characters, which will then behave as CC characters.
For lip-syncing and any other animation you will need iClone, but the converted G8 characters will behave as regular standard iClone characters.
I leave any licensing questions to Peter (RL), because I'm not sure about using imported DAZ characters that have been converted in games. I don't think that would circumvent the DAZ licensing.