So, I've not been using my Kemper through being burnt out with lots of work....but fired it up for 15 mins last night before updating to the 2.4 beta.
Wow! First impressions are that the amp B/M/T and Cab controls are much more amp like in response, and don't go to extremes like before. By combining the high and low cab parameters you can yield a lot of good and some almost lo-fi tones...but, the cab shift (i forget the button name) now gives that much more 'amp in the room' feel.
Going back through presets gave me the impression of a much 'warmer' tube like tones from a lot of amps. Not that they were 'cold' before, more if you shut your eyes you can smell the tubes cooking!
Btw, I just installed it straight over my previous 2.3 firmware - guess that's the right way to go?
Overall, it might be subtle - but it's definitely another tone leap forward.
-Tonerider