Going to jump into Season 4 when it starts on Friday. Trying to decide which class to go with though. Have any been substantially updated as a result of this patch or other recent ones?
Define substantially updated. Cause blizzard doesn't change skills much anymore (I mean they change them but it's all very minor tweaks) instead most class changes come in the form of redesigned/new items. In that case every class has had some pretty major changes in this patch as everyone has at least 1 new set or 1 old set that got changed to make them much more powerful (or in some cases both). You can't really go wrong with any class in s4 imo if you want to try out a new play style.