Every club is preparing to perform well next season and not only the clubs which you mentioned, dont be surprise if you see clubs that didn't perform well last season performing well next season, from the way things are going, no club should be underestimated. But i still have confidence that Manchester city is going to perform well next season, pep Guardiola is a experienced coach and he is doing everything possible to keep Manchester city in line.
With what Pep Guardiola has proven over some seasons now, I am still expecting Manchester City to look so strong next season, but I can't say maybe Manchester City will still win the Premier League next season, but I can say that from the team Guardiola has built, I am expecting them to perform well and fall out of the range of first, second. And for others, I am also expecting great performances from them teams like Arsenal, Manchester United, and Liverpool because I am seeing the team they are trying to build with their new signs, especially Arsenal for now.
I dont really know how Chelsea's performance will be next season, getting a new coach and players, it wont really be easy for them, so currently i cant predict how their performance will be, but lets just hope they perform better next season.
Chelsea's New coach, Mauricio Pochettino, was once a Premier League coach, and from his record, he performed well with the time he spent, and he is a recognized coach in the world as well, so seeing him as Chelsea's new coach, I am happy, and I believe he will perform well and take Chelsea back to its normal standard in the Premier League. So I am fully expecting Chelsea's performance to be strong next season.