Along with Canon EOS R5 development announcement, Canon today also announced that there will be 7 new RF lenses and 2 RF lens extenders coming this year. Including the RF 100-500mm f/4.5-7.1L IS USM lens, Extender RF 1.4x and Extender RF 2x.
Canon RF 100-500mm f/4.5-7.1L IS USM Lens:
Canon Extender RF 1.4x:
Canon Extender RF 2x: