Like any other software or operating system, each version of Debian has been in development for months. When everything is almost ready, the project puts the system in Soft Freeze, which is a somewhat flexible function freeze. Less flexible is the Hard Freeze where it has already entered Debian 11: From now on, there will be no major changes, or more specifically, you can no longer change anything in key packages.
Bullseye, which is how the next version will be called, will be released in 2021, but it does not have a scheduled date yet. Debian releases its software only when it is sure that everything is working properly, unlike its most famous son, Ubuntu, which we have known for months will release its new version on April 22. In fact, Debian 11's Full Freeze still appears as TBA (To Be Announced, to be announced).
Debian 11 is coming in mid-2021
As for the general news, since Debian is available with different desktops and each one includes its software, little is confirmed. Yes it is supposed to use Linux 5.10 as a kernel, as it is the latest LTS version of the kernel. It has also been known for weeks what will be your wallpaper, which is the one that you have heading this article.
For everything else, it is expected to include updated packages, such as "new" versions of Firefox and office software. If we put the quotes it is because Debian is a robust system, and it owes part of its stability to the fact that it does not update things as much or to versions as new as Ubuntu. In addition, the new ISOs will also include all the security patches that are already available in Debian 10, including several for sudo, one of the most important commands in the Linux world (and not just Linux).
If you are interested in trying Debian 11, you can download it from this link, but we recommend that you do it in a Live Session or in a virtual machine.