I think it is coming soon, at least for AP holders. I participated in a survey with three different kinds of bioscanners at Universal. One was like Disney's using 2 fingers. One was a fingerprint like at the lockers, and the last was one where you put you whole hand on the scanner with no "pressure points" to touch. I liked the whold hand one best. it was easiest and fastest.
I've used the one's at Seaworld (whole hand) and they are more tricky to use than the 2 finger (Disney). I've found that I've had to try a couple of times to get it to work before the gate would let me through.