I was just thinking of starting such a thread myself=)

I am thinking and really hoping for a full titanium frame. That should shave 1kg+ easily. Some bike shops (here in The Netherlands at least) do the telescopic handlebar conversion so it is not really new and groundbreaking or bike changing experience imo. There are the 3 handlebar options that suit most people, even tall riders. Also maybe a front suspension hub, although there is the Pantour. Another thing I would like to see is needle bearings in the rear hinge so that the need for the 200+ GBP tool to have the hinge serviced is eliminated.

As LittlePixel said it better be smt significant, not a new front bag.

-Carcinogent