Actually I think that the core fighters should have it after you are able to watch 10/11 lose poses even in that version: I remember that an user of this forum stated to have managed to unlock it.
Actually in a previous tweet Team Ninja stated that they are amazed by the number of outfits for male characters received:
@TeamNINJAStudio
Give it your best shot. That's all we ask to everybody. More male character than we expected so far. They are all good. RT @Platinum_Panda: @TeamNINJAStudio How many entries you have for Kasumi, Momiji and Lisa? Trying to decide who I design for. #DOACostumes
Source:
https://twitter.com/TeamNINJAStudio/status/448470084667723776
I don't think so, the update for the Arcade with Phase-4 is already out (the last trailer was related to her relase) and no new stage was promoted inside it. The 1.05 is adding only the new character but no new stages (also, the Japanese notes for the DoA5U:Arcade 1.05 don't talk about new stages).
Some days ago in a tweet, they had already announced that they would have posted a similar message.