There are reports floating around that Panasonic may be about to enter the full-frame fixed lens camera space with an official announcement this month. Currently, Leica and their Q3 is the only other camera in the FF fixed lens camera space (there is also the monochrom Q2 which actually costs more). Sony has recently discontinued
There is very close collaboration between Leica and Panasonic for digital cameras: (1) they are both part of L-mount, (2) the Q3 and SL3's AF software is basically the same as Panasonic's -- down to how the AF target boxes look, and (3) the Summilux 28mm f/1.7 on the Q/2/3 is actually patented by Panasonic (https://patents.google.com/patent/US20160266350A1/en)
I won't be surprised if an upcoming Pansonic FF compact is based off the Q3 with a different sensor.
