True about crits.
I built a pure rogue back then, planning to make her a mechanic II and then retraining her to assassin III, when assassin II was deemed less than desirable, and a "midway" exploiter drow, that I might retrain to rog2/ranger12/monk6.
They could both benefit from new features in U5.
On the other hand, I might have trouble with my current play-style regarding new sneak mechanics.
I can't shift from foe to foe while keeping stealth under U5.
Incidentally, I guess this also means a ninja spy couldn't build Ki while staying stealthy AND dealing damage in fire stance.
Which is maybe an issue they tried to address by "fixing" stealth.
...
On a related note: I am hoping they'll add new cloth armour that works with the "shadow monk" theme.