The update resets mouse sensitivity to default btw, just search in the My Documents config file for sensitivity and copy it over
I can't really tell much difference with the new client except for some nice new things to tweak in the options.
It feels a bit glitchy, like the way attacks combo together and some hits not registering, or turning 360 degrees in an instant (like the turn nerf is negated momentarily occasionally). I get strange sound inconsistencies with some sounds, some too high pitched, some too low
Oh and if we have to use EU4, please make it daytime sometimes, its annoying to play always at night