75% male isn't such a big deal for me. A scant few god-tier females is more appealing to me than a whole mess of mid-to-high tiers ones, and I tend to prefer M/F ryona anyway! In fact, I would be happy if it was just Kitana, Sonya, and Cassie, up against sixty guys, but as an obsessive Kitana/Sonya fanboy, I suspect my opinion on this matter is rather extreme and non-representative.
The character models are a bigger deal, and I'm still not sold on them. Having "realistic" body proportions isn't REALLY that big of a departure - up until MK4, all of the digitized actresses (save Kerri) were built like your average, physically active, pretty girl-next-gym. The original Kitana, for example, was only about a B-cup, maybe a small C. BUT STILL. This is a video game. A video game about kung fu and dragons and fire-spitting ninja ghosts! It's meant to be over-the-top, unrealistic, and aspirational.
I actually wouldn't mind getting a petition going, asking NRS for an optional "DoA slider", or "sexy code" similar to the old console violence censorship stuff, that would allow fans who want awesomely proportioned models to have them. In fact, I'd be willing to pay for it as DLC, up to and including half-again the base game cost (any more than this, however, and I'll demand actual nudity). Barring that, there will certainly be a community effort to mod the game, so we'll just have to wait and see what happens.
Kitana's alt looks interesting. While I haven't seen it in action yet, the concept sketches makes it look like she'll be a sort of Maki/ Ayane-style ninja. Cassie should get a classic Johnny Cage-style alt. That is to say, tight pants, sunglasses, and totally bare-chest topless! It won't happen, but it'd be fun.