Very interesting read.
So, basically if you want to go extend UFO in the Gollop's vision:
- accessibility: a teaching system while playing / complexity revealed gradually (good for people new to xcom)
- don't get in temptation to make things big and complex (like combining TFTD and UFO)
- more variation in tactical missions, like randomly generated UFO interiors (or different UFO maps for the same ufo type - already suggested here, and more maps in general)
- better AI (working on it :p)
- skill trees for character development (hmm, interesting, it would be nice you can spend skill points instead of the system choosing it for you - this is already requested a lot)
- fix psionics (a must but not sure how)
- more interesting weapons (interesting suggestions on this forum too)
- convincing destructible terrain (also already suggested : collapsing of buildings etc)
Ok.. we'll know what to put on the roadmap for openxcom version 2.0 ? :p
But overall he is not -yet- very excited about the Firaxis game, now is he?