The next big release of the distribution Ubuntu Linux it will be Ubuntu 21.04 according to Canonical which published the official release schedule. In the program there is also the date of final issue.
After its release Ubuntu 20.10 (Groovy Gorilla), will be released on Ubuntu 21.04, whose code name will begin with the word "Hirsute" and will be followed by an animal name starting with H, which will probably be voted on by the community shortly.
As the release number suggests, the final release is expected in April (fourth month) of 2021. According to the official release schedule, the final release date is set for April 22, 2021.
It is too early to know its new features Ubuntu 21.04, but one thing is for sure, it will be released with the upcoming GNOME 40 desktop environment and if I'm not mistaken it will use Linux kernel 5.11 that will "play" during that time.