1. I do actually know a few kids from camp i attended to a few years ago that had implants since they were babies, and they did indeed talk "deaf" so you are right, not all CI babies will develop speaking skills as well as a CI baby who speaks just fine.
2. I know both CI users and non-CI users have accommodations, but I think CI users use less accommodations, as you dont need an interpreter all the time ( if you struggle lip reading). I dont think a non-CI can survive mainstream education (elementary to high school) because I went 6-8 weeks without hearing, had to have an interpreter, i struggled and hated school. I actually left school early each day because I was stressing out, and grades dropped dramatically.