Nice that they're finally coming out, even if needs a Pokemon Bank account active. But then again, I bet people will be breeding the hell out of these, like what happened when the HA Johto and Unova starters got released in OR/AS.
Incineroar will definitely see some rise in a tier or two with Intimidate now being a thing on it. Not sure if Decidueye and Primarina's HAs will improve them competitively, but we'll see how it plays out. Liquid Voice I think will probably see more Doubles usage for Primarina, since a Water-type Hyper Voice will have one advantage over Sparkling Aria, which is only hitting the opponent's side and not your own teammate.