Sorry for chiming in late, but I given that
https://git.savannah.gnu.org/cgit/screen.git/log/?h=screen-v4 shows
already a commit "Release v.4.9.0" tagged v.4.9.0 in the screen-v4
branch from 2 days ago, I assume it's too late already.
Then again, https://ftp.gnu.org/gnu/screen/ shows no 4.9.0 release yet.
It will take a few days, I guess. There is one issue with the FTP GNU server right now.
After it is solved and my signed tarball will be available, I will post "news", etc.
As I said, in case I missed something, please remind me...
It's too late for 4.9.0, but I'm going to release the next version soon.
Cheers,
Alex