Doubt it'll happen.
It's up to Arc after all, but making it so you can switch willy nilly between powers would kinda remove some of the impact of choosing a power (whenever you get a choice)
And if you could switch for Luna, then people would start asking about the other characters and... no.
Look, if you want to switch from Shatter to Awaken for Luna.
Join the discord server, try to find me or ask in the help channel.
I can modify your save.
But I really don't think this makes sense as an ingame feature.