In the fall 2009 edition of vertiflite, they have a 5 page X2 article written by Frank Colucci. One quote from page 28 of the article:
Originally Posted by Frank Colucci
For all the challenges, the ABC demonstrator was exceptionally responsive. The XH-59A flew snap turns, high-rate sideslips, and level transitions from hover to forward flight. It pulled 2g turns at 240 kt, limited by design considerations. One Sikorsky pilot estimated the ABC was 50% more maneuverable than a single-rotor helicopter of the same size, and the Army concluded that the XH-59A, with no anti-torque rotor to waste power, was more efficient in a hover than conventional helicopters. Plans for a fixed auxilliary wing on the XH-59A proved unnecessary. According to Art Linden, "the one thing we proved beyond a shadow of a doubt is we did not need the wing... [the rotor system] developed all the lift you could ever use."
So I would think you would not need a wing. The ability to generate lots of lift also can translate in the ability to pull G's, or to manuver. The LTH mockup shown in the same article shows some rocket-pod looking things. No sense putting wings on, that is only more drag. If adding more wings always made things better, we would all be flying around in triplanes.
I wonder how well the servo flap idea would work on the x2.
-- IFMU