The Olympus 300mm lens will sell for $2499 (hopefully a lower street price) this year and is claiming 6 stops of image stabilization when combined with in-body image stabilization.
It’s nice that m43 Cameras are finally getting some decent telephoto options. Panasonic will be releasing their 100-400mm lens as well ($1799).
This video was shot on the Panasonic GX8 body. The image stabilization looks good considering the focal length.