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Here is a screenshot of the new autopilot, as you may see it's built upon the model found in FS2004's Boeing 777 (simple and complete with almost all autopilot switches). The new autopilot feature is now finished and fully functional.

Meantime, new ideas coming out: do not strip the old Fly-To routines (which are still fully functional, I have just commented out the source code), yet improve them by adding "Fly To Plan Waypoint" and "Flight Flight Plan" (a Super Flight Planner internally simulated GPS). Another is "Do a 360 deg turn", to avoid FS ATC coming out with "Please expedit descent to etc. etc.". The plane will do a complete 360 turn while keep on descending. Chances are I can add these new features with final release.