MAP did you order online or through a dealership? I am considering having the iPhone kit (forget what it's called) for full integration with command online. From what I have read MB has been slow with catching up to iPhone 5, but you should be able to use am adapter to go from 4s pins to 5 pins. My concern is the phone is meant to lock into some form of a cradle, as it is designed for a 4, I don't think the 5 will fit.
I spoke to the dealer and he organised the boot liner. I think the boot liner is going to be quite useful, looking at the shape if the boot cleaning it is going to be a pain.