I bet what happened was that GP realized that one of their wing jigs was warped, and so they sent new wings to people who got models from that jig as a pre-emptive, keep-customer-satisfaction move.

As for setting up the ailerons, just eyeball them as best you can, and you should be fine. THe key is to try and get each wing half to be as close to mirror images of each other as you can. This way the two wings should produce the same lift right up to stall, and they should stall at the same time. Turn your radio on, center your ailerons, and look at each wing tip. The ailerons should be an extension of the an imaginary line drawn from the leading edge to the center of the wing hinge line. Then look at the center section of the wing from behind the wing. The inboard trailing edge corner of each aileron should line up with each other.

While you're at it, do the same for the elevator halves. Make sure everythings lined up nicely.

And you *SHOULD* be fine...
...famous last words... I know

Tom