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Is c.C cancellable? c.D?
Mook says yes to both.
Can you activate off a naked df+D?
Technically no, but Madman says if you empty cancel into the df.D, it'll work (Cool!).
EDIT: Just tested it with d.A (empty cancel) into df.D.
Is s.CD cancellable into df+D on hit or whiff?
s.CD is cancelable. I've noticed in XIII that if the normal cancels, it'll empty cancel (like the s.CDs have always have) e.g. Kensou s.D (empty cancel) --> qcb+P
Any air normals cancellabe? If so, will a fireball combo from it?
j.A and j.C are cancelable, haven't tested it but logically it has to otherwise they wouldn't make it cancelable.