During the “ KONOSUBA Channel from Isekai Museum event , the production of a new anime KonoSuba franchise . According to information from the live stream, there is no confirmation that the new adaptation is the long-awaited 3rd season .
Therefore, the team asked fans to be patient, as new information will arrive later.

Synopsis
After a traffic accident, Kazuma Sato's brief and disappointing life should have ended, but he wakes up and sees a beautiful girl standing before him. She says she is Aqua, a goddess, and asks him if he would like to go to another world, taking with him just one thing from this world. Kazuma decides to take the goddess herself with him, and they are transported to a fantasy world full of adventure, dominated by a demon king. Now Kazuma just wants to live in peace, but Aqua wants to solve many of the problems of this new world, and the demon king won't ignore them for long...
Konosuba originates from a light novel , and inspired the production of two anime seasons. The first season premiered in January 2016, while the second season premiered in January 2017. Furthermore, the franchise received a film called KONOSUBA – God's Blessing on This Wonderful World – Legend of Crimson , the film then premiered in Japan in August 2019.
Finally, the light novel ended in its 17th volume, released in May 2020.
Source: ANN