I got some more leaked A7c images (se below) and new info:
A7c will have a similar passive cooling system like the A7sIII so it won’t overheat when shooting 4K for a long period of time. It will also not have any recording limits, unlike the A7III’s 29-minute recording limit.
UPDATE: And Sony New Zealand shortly advertised this free battery bonus deal:
Thanks to the two tipsters!
Join our new Sony A7c facebook group.