You can now preorder the brand new Canon EOS Rebel T8i and the Canon RF 24-105mm f/4-7.1 IS STM.
The Canon EOS R5 will not be available for preorder until the official announcement, likely a couple of months.
Canon EOS Rebel T8i Body $749
Canon EOS Rebel T8i with EF-S 18-55mm IS STM $899
Canon RF 24-105mm F4-7.1 IS STM $399
Canon EOS R5
Canon RF 100-500mm f/4.5-7.1L IS USM