Identify canard, low-wing, single pusher-prop plane over Upstate NY
There are a number of near-copies of the Long EZ, with nearly identical wing and canard shape; they differ in number of seats, performance, range, and, yes, several of them have retractable gear.  I think there's at least one that's pressurized.

Without a high quality photo (possibly even with one, if shot from the ground), it may be impossible to determine what you actually saw -- but a single pusher propeller, low mounted cranked/swept wing with tip fins, and swept canard originated with the Long EZ (before that, there was the Vari-EZ with unswept canard, and the Vari-Viggen with a different wing sweep profile).