I’d be interested in a few things: (some have been mentioned, so +1 on those)

-Bike lights
-Buck+boost drivers
-Magnetic attaching+onboard-storing diffusers (90deg or side switch lights)
-Headlamp with large LES and high CRI (linear array of Nichia 757?)
-RGB color ramping aux LEDs
-USB or BT programming connectivity
-LEP thrower
-Diecast designs
–14650 based EDC with A6 style FW (think 15mm longer ET D25a)