The 'coy' wave to the crowd happened months ago at one of Meghan's first post engagement interviews. She hasn't done that wave since, nor has she clutched at Harry's arm at all in recent engagements. They are never seen out together privately so no-one can say what they are like together and with friends, but I would bet that it's the same as it's always been.
As for Harry's demeanour, he is extra protective of Meghan, a foreigner in a country where she's been hammered incessantly by a feral tabloid press. Other than that (and I've followed Harry since he was 19) I see no change in him. Physically he's just thinner these days.
I'm just mystified at the constant negativity towards this couple.