It apparently will be called the ZV-E or ZV-E1 and seems to essentially be an A7Siii in the rangefinder-ish body of the A7c.
The following specs are from rumour sites so take with a pinch of salt but if this is accurate then it will be an interesting release.
12MP sensor from the Sony a7s III
4k 60p and 4k 120p video (no crop)
Max ISO of 409,600
No pixel binning
AF from a7R V, but it has even better detection
New AI features
Priced expected