You are right James, the Felix (and W.12) were the Christmas Surprises last year. The AEG release date was announced ahead of time and was long publicized as in development.
My bets for the CS this year follow. I think it will be a large kit; probably two seater, as that been the tradition, and expect it will be a Western Front type like every other WNW release so far. In my order of likelihood:
1) Halberstadt CL.II
This Western Front 2-seat / fighter / ground attack workhorse has, AFAIK, never been kitted in 1/32, at least in injection molded form. A great shape and many colorful Schlasta markings make the appeal of this kit a no-brainer. Sooner or later WNW has to produce one, right?
2) Breguet Br.XIV B2
This would make a nice companion to the Salmson, another important type that hasn't been kitted in 1/32. A big brute of an airplane with lots of cool marking options.
3) Vickers F.B.5 Gunbus
It's been awhile since WNW has released a pusher. This would help round out the early war combatants, the first true operational fighter and one of the few opponents for the Fokker scourge at its height. Appeal? All those wires!
Long Shot) Armstrong Whitworth FK.8
A lesser known RFC type, overshadowed by the RE.8, but important nonetheless. Not the prettiest bird, but a mind boggling array of variants add interest and appeal to this kit. This would be the kind of out-of-left-field, yet still within the wheelhouse, kit that only WNW would drop.