For me the most important new things on Debian Trixie are the Linux kernel supports.
First is the use of 6.12 where the kernel now starts to have real-time capability that was more than 20 years in the making "so now you can run your space laser or audio production without specialty patches" [1].
Second is the official support for RISC-V64 on Debian Trixie [2].
[1] Real-time Linux is officially part of the kernel (138 comments):
teleforce•3h ago
First is the use of 6.12 where the kernel now starts to have real-time capability that was more than 20 years in the making "so now you can run your space laser or audio production without specialty patches" [1].
Second is the official support for RISC-V64 on Debian Trixie [2].
[1] Real-time Linux is officially part of the kernel (138 comments):
https://news.ycombinator.com/item?id=41594862
[2] What's new in Debian 13:
https://www.debian.org/releases/trixie/release-notes/whats-n...