Yup. I've had this in my Steelseries Apex Pro for a couple of years. I can adjust the trigger depth per-key.

It's is WDM, but instead of multiple low frequency lasers firing at once, they've got a single high frequency laser firing multiple wavelengths. They've taken the lead from other high-speed data busses like IDE and SCSI in transitioning from parallel to serial, as (I presume) cross-talk must become an issue as speeds rise.