We're told that Canon may announce two more RF mount lenses in 2019, but it's possible they will get pushed into early 2020.
Apparently, the original plan was to announce the development of 8 lenses with the EOS RP, but for whatever reason, that plan was scrapped. Lens launches have always been a moving target.
We weren't told what the other two lenses might be, and we don't want to guess at this point in time. One patent in particular maybe give us some clues about what's next for RF mount lenses. The patent shows optical formulas for an RF 100-400mm f/3.5-5.6L IS USM and a likely Non-L RF 70-300 f/4-5.6 IS.
We do think the extremely popular 100-400mm zoom will be one of the next few of lenses to be announced.
I suspect we'll get more clues over the next couple of months with further patents being uncovered.
We don't yet know when the 6 latest RF lenses will begin shipping, but we think that'll come into focus in Q2 of 2019.
There is no further news about the next EOS R camera body.