definitely not for PS. PS5 will be holiday 2020 and so they will announce Feb-June 2020.
MS might try to get ahead with a spring 2020 release, as it's the only way that be ahead in sales for a while, which they will shout from the rooftops. I expect evert studio is now working on Nextbox games if they don't have something announced already. It could be possible that Halo Infinite would be ready for launch, and Forza 8 as there is not Forza this year. So I think MS could announce at the Xbox event in Autumn,
but my bet would be that we hear nothing from both