Your new graphics in 2.5 are less realistic, more designed, which is fine if thats what your after, but it looks less finished and a bit cheaper in my opinion, but more importantly they make it harder to see the values of the parameters!
The colours around the knobs are now washed out pastel colours, and the text around the knobs is light grey against white, which may suit the more minimalist look you've gone for, but its not helpful, in fact its kind of dumb. Please correct this and replace the colours around the knobs with something more legible, and use a darker grey for the text, its a synth, not piece of graphic design!
Brian