A source (Thanks!) just confirmed the new Panasonic Varicam that will be announced on Friday has a new S35 sensor. It also has EF mount.
I still was not able to confirm these full specs I got weeks ago from a new source:
S35 sensor (from the Varicam LT)
EF-mount
14+ stops of DR
4k/1080p 10-bit 4:2:2 recording
Possible Prores recording
Two XLR inputs
SDI/HDMI output
Dual SDXC slots
Detachable sidegrip and top handle
Price: $6500
In the meantime Panasonic published that teaser video: