Tiktak24 said;
Heard via a secondary source the imminent development of terminal and apron near stand 14 area will be capable of taking a B777 perhaps in the evening
This is the new stand 12 which should become operational in the spring and is basically just a new centreline in between, and therefore incorporating, stands 11 and 14. It is initially intended for the Etihad and Qatar Airways flights. The former is a morning A332 flight and the latter is an early afternoon B788. Stand 12 used to exist many years ago but the centreline was removed not long after the SE Apron was built. It's still shown in the (somewhat dated) aerial view in Google Maps
http://goo.gl/maps/FK0b6 but is missing in this (more recent) aerial view in Bing Maps
http://binged.it/1KLGyhS .
The most likely long-haul destinations for an evening flight from EDI would be either the far east or middle east. What rumours about B777 flights have you heard Tiktak24?