Olympus has announced the development of the M.Zuiko Digital ED 150-400mm F4.5 TC1.25x IS Pro super tele-zoom lens. Designed for Micro Four Thirds system cameras the lens will provide a standard focal range of 300-800mm equiv. and with a built-in 1.25X teleconverter it becomes 375-1000mm equiv., at the cost of 2/3-stop of light. The lens will also be compatible with Olympus’ new MC-20 2X teleconverter.

The Olympus 150-400mm F4.5 Pro lens will be stabilized and work with the 5-axis IS systems built into modern Olympus cameras for extra shake reduction. Fully weather-sealed lens from Olympus could work at temperatures as low as -10°C/+14°F.
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https://www.dailycameranews.com/2019/01/olympus-150-400mm-f4-5-pro-lens-with-built-in-1-25x-teleconverter/