Well when I first started you finished a punch with the whole fist turned over, so knuckles parallel to the floor. But now the fist isn't completely rotated 180 degrees from your hip to the end of the strike, it's almost like 120, so you avoid locking out the lats and tensing up your shoulder. Being Shotokai is a "soft style" avoiding tensing up is a big thing. We also use fudodachi stance waaay more in kata than we ever did before, it used to be zenkutsu in most of those situations. Weird stuff like that.
To be honest I'm not sure if it's the satellite dojos coming up with this stuff or if they're getting it from Harada Sensei when he periodically visits them from Japan.