Except the AC team has rendered all of that.  There have been dozens of female characters in the games, including Aveline a black female lead in Liberations.

With Unity they made the choice to have the lead protagonist be a male, and that’s their choice.  There will be women in the game.  Chances are the women will be well written and portrayed, as they generally are in AC games.  Women were not included as playable character models for several reasons, including complaints that the team lacked the time or resources to do so (potentially bullshit, but possible as new skeletons would have to be made for every animation as, shocker, the proportions in limb and torso are different, on average, for men and women, and the team has had less than a year to make the game) and that no matter what you choose to make your avatar in other people’s games, the avatar you will always see while playing is Arno.

The most commonly stated complaints are fair, to a point, but also largely overlook what the same group has done in the past.  Unity could have female assassins be playable, but they’re not, and that’s their choice be it one they made at the beginning or due to limitations.  What people tend to forget is that we are in the age of DLC and post-release patches.  Ubisoft has said that they want to include female models, but lacked the resources.  They have included them in the past, and can again in post.  It happens.