It was An anime that popular at the end of 2018, Zombieland saga season 2 confirmed got their second season in the next year. Season 2 of the Zombieland Saga, titled Zombieland Saga: Revange, is likely to continue the story of Minamoto Sakura and his comrades who have risen again as zombies.
The anime Zombieland Saga tells about the journey of Sakura Minamoto and other members of Franchouchou, who live again as a zombies who raised by Koutaro and in order to created an idol group to revive the economy in Saga.
for the storyline of the Zombieland Saga season 2 anime itself is unpredictable, because it is an anime that has an original story which does not take references from an LN or manga. anime with an original storyline like this has the advantage that we will feel comfortable while watching and not exposed to any spoilers because the original anime does not take reference from a manga or LN.
but that's also the weakness of the anime with the original storyline. where the anime with the original storyline has no continuity after the anime ends, and if the anime ends with an ending that makes the audience less satisfied or get adapted for the next season but has a very long span of time making the audience unable to find references or read further from the anime. it different from the anime that adapted from a manga or novel, where the audience can continue reading the manga or LN from the anime after the anime has finished. even if the anime doesn't get continuation for the next season, the audience can still read the manga or LN.
for the release date of the Zombieland Saga season 2 has not yet been announced but certainly Zombieland Saga season 2 will be released at the end of 2021. and even then if there is no delay due to the many anime postponed this year, because the anime delay this year has a domino effect which will also affect the showtimes for the anime afterwards.