The new chop gesture launches the flashlight fine for me, but the wrist twist has never worked to launch the camera. (Droid Turbo, Lollipop now, stock camera app.) I've never run the Moto app; do I need to?
Answered my own question: for some reason this feature is just off by default on my Droid Turbo (while flashlight chop is on). It can be enabled through Settings > Moto > Actions without having to run the Moto app and opt into other features I don't want.