As you know the new super telephoto zoom Olympus M.Zuiko Digital ED 150-400mm f/4.5 TC 1.25x IS PRO lens is in development. According to recent reports the lens will be released around Fall in 2020.

A German interview with Olympus Forum shared some interesting details about the future Olympus products. From the interview, looks like the Olympus M.Zuiko Digital ED 150-400mm f/4.5 TC 1.25x IS PRO Lens will be available in late 2020. This will be an amazin companion for wildlife photography.
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https://www.dailycameranews.com/2020/04/olympus-ed-150-400mm-f-4-5-pro-lens-release-date-scheduled-for-fall-2020/