Release target is tentatively mid April according to here..
Absolutely not! There are a many features in 10.9, check out the “release-highlight” PRs on the repo: https://github.com/jellyfin/jellyfin/pulls?q=is%3Apr+label%3Arelease-highlight+
That is only a part of the changes, there are some more UI changes to the dashboard, many bug fixes, and performance improvements.