About personalization system... It sounds interesting but I have to agree with TT on ninja colors. I always thought that colors were their trade mark. I don't want to see pink Scorpions or yellow Reptiles etc. I know that nowadays it's possible to recognize ninjas not just by their colors, but it is more than recognizing. In Tekken I also recognize fighters but since that, Tekken has become something you call "weird japanese sh*t" IMHO - King with a pigeon head or other weird stuff.
Up there there is an idea about customization that would make sense (Scorpion and yellow shades etc.) I want MK11 to have possibilities of combining different outfit parts that suit the character. Classic Scorpion in our new trailer seems to combine his UMK3 body with a MK2 mask. Such things would be great and I don't think NRS would do it too "Tekkenish".
Personally I'd like to try customizing a ninja outfit from the first MK movie. I really like the designs and masks. Combining outfits from 2D and 3D era would be interesting as well. I didn't play Injustice 2 but I trust NRS and I don't think they'd screw this game up. All in all and besides a few little flaws I am really happy with what they've done to MK since MK 2011 and this new trilogy.