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An unknown source is claiming that Canon is actively testing an RF 70-135mm f/2L USM with a very small group of photographers and videographers.
The same source claims that this lens will be announced in Q4 of 2020.
With IBIS coming on the Canon EOS R6 and Canon EOS R5, it makes sense to leave IS out of this lens design, anything to save a bit of size and weight will be welcomed.
This lens has been previously mentioned,but I caution that both of these reports come from unknown sources.