Twave hitting ground is dissappointing as I think it is almost broken now but whatever. The other type outrages are sweet. I especailly think thrash will be amazing especailly on something like Kangaskhan. I also love how hi jump kick got a boost. Although it is still risky it will greatly help medicham
It's unlikely Thrash will see much usage. Unlike, Outrage, its typing does not gain notable neutral coverage. Many Normal types, such as Khan that you suggested, have large HPs and access to Double-Edge if they want power. And next to that, Return offers more power than the Dragon's alternative, Dragon Claw.
Petal Dance could see use. Power Whip is not wide spread, and has accuracy issues. It entirely depends on what new Pokemon receive it in this generation though, because Venasaur, who has Power Whip, looks like the only candidate to employ its worth. And once again, unlike Outrage with Dragon typing, being stuck in a Grass move is troublesome.