Know exactly what you mean about missed opportunity for easy access to Edinburgh Airport. Should've been a station at Turnhouse from the 60s like Teeside Airport had.
However, bodge job coming along now;
What's happening? - Gogar rail interchange - Network Rail
(nb. curious to know which 100 cyclists are going to take on the roadworks at the Gogar & Maybury Rd roundabouts to get to their special shelter at the new interchange hub).
Reading this - looks like they've got three weeks to finish & open it.