Not really. CaS packs will be released on the same days as the characters, but you will be able to buy everything separately, so you can buy just a character or just a CaS pack, they are not bundled as far as purchasing goes.I just had this thought about season 2. We are getting a customization pack bundled with each character individually.
Art styles can be tweaked when it comes to guest characters.There are additional problems with Nakoruru (which are actually concerns that are typical of most SamSho characters, but to greater are lesser extends): her visual style does not work well with Soulcalibur's approach to modelling, its graphical fidelity, or its art design.
Just look at Mai Shiranui from KoF XIV and DoA6: