The replacement of Canon EF 200mm f/2L IS USM and EF 800mm f/5.6L IS USM lenses are coming soon. Canon EF 200mm f/2L IS USM lens is not available at most stores in US. This is indicator of the EF 200mm f/2L IS II USM lens is coming. Also the EF 800mm f/5.6L IS II will be announced soon. This new version would be much lighter than the old one.
Release date for both lenses for the official announcement may be after the announcement of Canon EF 200-400mm f/4L IS 1.4x.