Gavin,
Most of the public domain fly-throughs and artwork are out of date as soon as released. It's the nature of this type of project - the design and even the concept to some extent are continually refining at least up to the point where a construction contract is signed. The graphics provide an indication of where the design is going at this stage, nothing more.
Current plan is for the terminal building to start this Autumn, together with Pier 1 (opens 2018) and then Pier 4/C (2019). Dedicated bussing gates on Pier 4 Northern side , not on Pier 1, although in theory any gate could be used to bus from if no aircraft on it. Bussing arrangements still under review so may change! TP eventually swings the contact/remote stand ratio firmly in favour of contact, assuming all four piers are built.