Don hit the nail on the head.
Its hard changing teachers for any team, believe me it happened to us this year. Everyone, including the new teacher, was skeptical about how things would turn out not only for our FRC team, but the FLL and FTC programs as well. It really turned out to be one of the best and most organized seasons we've ever had.
This new teacher can help your team with direction and approach the problems with a new strategy. Just remember a really important thing that you need to learn in "the real world": you have to learn to compromise and adjust.
Feel out what this new teacher wants out of the program, for all you know she may be educating her students in a way you never thought possible on your old team structure.
Be open to change and be able to compromise with an open-minded attitude.
edit: haha you really did answer your own questions/concerns.