Is the NXT forward compatible with EV3 sensors and motors? Is it possible to use EV3 sensors and motors with the NXT intelligent brick? I've read that the EV3 is backward compatible with NXT motors and sensors, but does vice versa work as well? Is the NXT forward compatible with EV3 sensors and motors?
Short answer: you can use EV3 motors with NXT, but you can't use EV3 sensors on NXT. NXT sensors and motors work with EV3.

Detailed answer: read Laurens Valk paper.