Bundesliga will more tough than this season any of teams that as a plan to join the the Bundesliga league next season most have to prepare well, not like this season that the league is some how quiet, Bayern Munich need a better improvement if they really want to be the part of the clubs that will achieve the Bundesliga next season.
How will not say that their last season performance is poor, but compare to the others club their performance is some how low and if they didn't improve before the next season I don't think they can go any where with that performance, but let wait and if they can able to bring a positive changes next season.
The Bundesliga was quite interesting last season, but I feel that the next season will be more difficult than the previous season. Every team is getting the players it needs to improve its performance and battle for the championship. Vincent Kompany has a lot of work to do to improve Bayern Munich's performance and win the Bundesliga title, the club is adding more players to make it less difficult for Kompany to challenge Xabi Alonso, who broke their record. Bayern Munich performed badly last season, since I've known them, that was the first time they did without a trophy, in previous years, they won one or two trophies per season.
I think Leverkusen will play another strong season although I don't think Bayern will be as weak as last season.
Of course, I believe Bayer Leverkusen will have a difficult time next season because Bayern Munich has signed more players, however, Bayern Munich had a poor performance due to several players who were out of form and injured, such as Coman and Gnabry, who were unable to play throughout the season. If Kompany can improve the players, I believe they will be successful since they conceded a lot of goals last season due to a weak defense, and Kane contributions became useless, scoring 40 goals but winning no title.