The Canon EOS R6 has shown up for certification under the name DS126831.
Canon EOS R6 Specifications: (New information in BOLD)
20mp full-frame CMOS sensor
12fps mechanical and 20fps electronic.
4K @ 60p
FullHD @ 120p
Dual card slots
No top-down screen
Lower resolution EVF than the EOS R5
Build quality not as good as the EOS R5
Bluetooth 4.2 (EOS R5 to get Bluetooth 5.0)
LP-E6NH Battery (Same as the EOS R5)
The latest rumored announcement is July 2020