I just took my first look at the control centre, cluttered and messy, the controls on there seem almost random is their choice to me, it took a while to figure out what was there and what was needed. There are some functions on WP though that I would like to access faster, with the camera button I never need that, but turning the wifi on/off etc would be useful, perhaps the best control centre would be one that auto learned from how the user used the phone? As for its look, a tile based look to it sounds clean and easy to understand.
The notification centre looks cleaner, although I'm still holding off making any verdicts on notification centres in general since as a user I've not yet seen one that makes me think that WP is missing a feature, perhaps I just do not use enough social networks at the same time to make them seem useful?