Who knows, Apple could go for a slightly slower lower power option too.
I don't know graphics card stuff. Nonetheless, doesn't it seem that, because Apple seems to deem Intel's integrated graphics as providing sufficient battery life when not doing anything intensive, when doing something intensive on a higher end pro model, battery life isn't that much of a concern because, hell, you're doing something that needs more power.
I don't know. I just think the disparity between battery life and graphics performance should grow as you go more pro.