Obviously building a brand new terminal with pre clearance in mind is a huge advantage to MAN. As a controller I must say those cul de sacs look like a right pain in the a***, as they only allow one in or one out at a time, whereas with toast racks you can bring them in one end and out the other, reducing delays, but I've only seen the MEN photos, and you need taxiways at either end of the terminal, which requires more space, tunnels for roads or trains etc.
The pier configuration of the new MAN-2 is reminiscent of Don Muang (Bankok).
The MEN photos do look good, and the plan to link up MAN-2 and MAN-3 airside is plain common sense. Will there be a dedicated terminal for no frills carriers?
Stansted has double pushback cul-de-sacs which seem to be quite efficent. Probably not as good as the toast-rack design at Heathrow but probably a lot less expensive and still reasonably efficent. If that is the plan here though I don't know.
Maybe the new MAN-2 piers arrangement is based on STN (MAG owns both airports).