For anyone interested...the 70ks showed up today. The only pro stock mods I can actually see are a clarino liner, a reinforced tongue (unusual but comfortable and seems very protective), and higher quality eyelets the whole way. There may be others that are related to foams or construction (I haven't had retail 70ks). My first impression is that they are (as folks say) incredibly comfortable out of the box. Also a really sweet flex profile.
I took them to my LHS and had XS holders installed today. It's actually cheaper this way cuz I already already have several sets of Blacksteel from the AS3 Pros. I'll pick up tomorrow and bake them. I have a three hour practice/ scrimmage tomorrow, so not even thinking of wearing them unbaked for that. Three games and a practice next week and a week-long camp, practice and two games the following week, so plenty of opportunity coming up. Total investment is about $500. If they work out...that $600 less than total custom 100ks. These actually seem to have a nicer flex. That's just in the house...only skating will confirm it.