Hello,
Is there something in the works for power cards? Similar to D&D spellbook cards?
It sounds like this question might be one that you’d need to ask the Marvel team. We are excited to be an official digital partner of the game, but only make digital products to support the Marvel Multiverse RPG. Only Marvel is in the development of physical products for the game. 
This reddit post has power cards you can print out.
https://www.reddit.com/r/MarvelMultiverseRPG/comments/18yxp7q/printable_power_cards_version_11/