The new design is a bit busy but it's still cute and serves well 2 purposes:
1. Likely to showcase an alternate reality
2. Sell merch.
As long as the creators of the story are compensated by merch sales then it means we will get to see more wonderful stories from said creators
Madoka Kaname's old dress vs new dress
The new dress will be featured in Puella Magi MADOKA MAGICA -Walpurgisnacht Rising-