Pretty much what ever one else said but I will emphasize speaking for myself these particular ones I want to see next game or even have a DLC Patch made for lol
Improvements
-1P AND 2P Outfits: I really was disappointed when I found out that you couldn't use any of the main casts' outfits in this game. And it sucks even more because I personally like a lot of the costumes in this game a lot more then the ones in SCIV, especially ones like Ivy (1P), Cervantes (1P), Raphael (1P/2P), & Viola(1P/2P). So yeah, I really hope they give this option.
-More Hairstyles: Like a lot have said, all they really did was recycle the same ones from SCIV and some of the hairstyles of the new characters. Like another user said, I really wanted to use Natsu's 2P hair but instead get stuck with her ugly random ass 1P hair (no offense lol). So yeah, definitely add more hairstyles please Namco? Or even better, why not enable us to create hairstyles like you can in Tekken 6 where you choose a front, left side, right side, and back for the hair?
-More Clothing & Accessories: Yes, like others stated, would love to see more clothing. I'm more for authenticy so I'm sliding more to traditional clothing like...
Japan: Hakamas, Kimonos, Geta, Hair ornaments, Ninja gear, etc. They pretty much covered this but I really wanted a pair of Okobo sandals (Platform sandles usually worn by Geisha) and a more stylized Kimono similar to Setsuka's outfit in SCIII.
China: Cheongsams (of all sizes), Chinese Robes, etc. All they did was re-use the China Slit dress, changpao, and a few helments... Would love to see more Chinese inspired clothing/accessories for DLC or in the next game.
You pretty much get the idea of what I mean. I wouldn't mind seeing SOME modern stuff but yeah, mostly traditional stuff. One modern thing I'd love to see is a modern Ninja bodysuit (I.E: Ryu Hayabusa of Ninja Gaiden wears a modernized Ninja bodysuit).
-Bringing back old school outfits of the previous cast for CAS (SB/SC, SCII, SCIII, & even SCIV of all characters' outfits).
-An option where you can add tears, rips, stitching, lace design, Mesh design, etc to clothing. Like for example, let's say I put a pair of hakama on my character but I want the bottom of the pants to be ripped and slightly tattered, they should add an option where you can add those kinds of details. Of course, they should apply this feature to most of the clothes. I mean, if Tira can wear tattered clothing (SCIII 1P & SCV 1P) or Mitsurugi can wear tattered hakama (SCV 1P), why can't our characters? lol
-More stickers/patterns. One I would most like to see is a fishnet & lace pattern and also a lace up sticker.
-More Equipment slots for Special Items and while I'm at it, more special equipment like anklets, ruffles, tails (wolf/fox), and so on.
-Asymmetrical Shoulder equipment
-Fix clothing issues/glitches/malfunctions ~ I think it looks awkward how some of the equipments (mainly shoulder equipment) looks like it's floating away from the character. As for a malfunction, I noticed on the girls that whenever I try to put on the black tights with the stiletto heels, it cuts off at the ankles and it just looks tacky. Please fix it so that the stocking goes all the way down into the heels instead of cutting midway at the ankle.
-More voices and please fix the pitch/toning. Most of the time when you try to change them, they sound like computers talking. lol
-Built in feature where when you create a character on a slot, you can also create a 2P outfit. Example, when you go to "Creation" and you pick a slot, when you click on "original creation", it'll pull up 2 more slots (left & right side). These indicate 1P and 2P outfits. If that makes sense?
And that's pretty much all I got lol