Anyway the first character who's been redesigned is Miku Sassuran. Below is her original design which was seen in the first edition of Gesen that went online.
Her appearance was very similar to that of Asuna Kyuno's, you could even argue that she just had a palette swap. So, Miku's been redesigned...
Her colour palette remains the same, however her jumper has changed to a polo-neck, she now has a utility belt/purse/whatever you want to call it, and the most noticeable change is the increased length of her hair.