Now is more than clear that SJCAM is working on true successor of SJCAM SJ5000X and SJCAM M20. Sensor will be Sony IMX 117 F2.5 with 4k @ 30FPS 3840 x 2160 resolution. Also new SJCAM SJ6 Legend will feature touch screen with 240 x 320 resolution. Welcome addition is support for external microphone (finally)!
SJCAM SJ6 Legend Specifications:
Some more SJCAM SJ6 Legend photos (renders)