So what could it be? Well, having already 'done' Polaris and knowing there isn't enough space for three crowns with full compression keys; (half keys were adopted on the chronograph for this reason.) How about they relaunch the Memovox Deep Sea Alarm? But with two changes:
1 Rotating conventional diving bezel - like the current JLC diver. Good idea.
2 Ruin yet another otherwise good looking JLC watch with the stupid compression keys. Bad idea.