Personally I think Chelsea will improve and I also think that this upcoming season their main objective should be to achieve a spot in the Champions League for the next season,a Champions League without Chelsea sounds a bit strange for this upcoming season.
I meant with transfers - not with training and mentality. They are incredibly weak in midfield and all of their CF/ST options are either young and unproven or simply not good enough.
They are good on the flanks - both defensively and offensively - but without 2 new starting midfielders I think they won't be able to cope. Their midfielders are currently Fernandez, Santos, Gallagher and Chukwuemeka - sounds like Fulham, not Chelsea.