I'll quote a few paragraphs from the detailed preview so you can get a jist of what they're talking about...
If this is something you're interested in then you should definitely read the whole two-page preview over at SPOnG.
Cameras have various settings – you can either choose from a list of preset views (a side or chest shot following Niko for example) or a custom camera where you can have some form of control over the angle.
Using the ‘target’ setting you can even focus your viewpoint on any character that’s present in the area, so you can change from a close up of Niko unloading a shotgun into a cop to a bird’s eye view following said cop flying backwards.
Using multiple markers in the seek bar, you can even have a dynamic swooping camera; you just need to have two different locations and angles set, apply a Movement type and the editor automatically does the work for you.