I'll have to respectfully disagree with you on this one! Tire manufactures still use mould release agents to release the tire from the mould. Things might have gotten better where as it's not so bad, but you can FEEL the slick on new tires. You can even find tonnes of videos online with newbies and new tires washing out the rear wheel.
Continental Road Attack 2 is one of the first tires that just got released this year that isn't using a mould release agent to extract their tires. These tires do not require a break in period, they call it "Traction Skin." I haven't heard of any other manufactures using this process so they're still doing it the old school way!
From Conti: Traction Skin: the revolutionary new micro-roughness of the tread optimizes the mechanical adhesion and offers the safest, fastest break-in period in the market
OP, I would take it easy for the first 100km.. when I got my new tires, they definitely felt squirmy but after 100km, they were grippy as ever!