As a teacher, yes differentiation is the buzzword of the day. It is a great idea in theory but difficult in practice. Just one more thing to ask " are they ensuring that students who are on IEP's and performing significantly below grade level will not be in your child's class." the reason I ask is that it is completely unreasonable to expect one teacher to differentiate for students both 2 stadard deviations below and 2 standard deviations above grade level. This will let them know you are aware of what the lingo is. I agree don't sign until you can review. I also have asked to tape a meeting so that no one can go back and say something wasn't said.