I'm excited for this era and all, but Katy needs to work on one thing.
Her vocals.
She can sing, but she needs to stop being nervous on TV. She needs to work on her songs so she can sing them live and in the studio. She needs to stop coming in off key and she needs to start coming in in tune. I've heard very few performances where she was actually in tune.

I know I'm complaining, but it's seriously her weak point. Her songs are not particularly hard to sing. I would know this. I've had a trained singing voice for four years.
She just has a hard time controlling her voice, especially in uncomfortable positions (TV). She sounds great on tour, but she should know 95 percent of the GP only watches her TV performances.

She needs to step up her game. She doesn't have that focused mindset and she settles and falls short of the bar of excellence. She needs to change her attitude.