I was looking at the 50.2 datasheet, and ZL is going to have to pull of some magic to get 2400 OTF lumens from a single 50.2 on a single 18650. If it is a single LED like other ZL's, they'll be boosting up over 6.0V, gotta be well over 4A (maybe 6A even), and over-driving the emitter quite a bit. This light will have to be the hottest ZL ever made, and might even drive some changes in the body shape/weight to handle the heat.
As per information from ZL emails posted here recently, ZL is not overdriving their LEDs at all, ever. The SC600fd III Plus is already draining up to 8 amps, so no biggy. ;-) Yes it will get hot quickly and step down, probably comparable to the SC600fd III Plus (after ~45 seconds).