The 40Ft mid-door definitely has a queen size bed. When we bought our 07, we specifically asked the factory rep if there was any way that we could get a mid-door with a king size bed. He checked with the engineers, and they said "not possible". So, at this time, a king size bed is not even an option with a mid-door. Of course, that's not to say that the factory can't figure out a way to do that in the future.
Good luck finding the right floor plan!
Gail, John & Mindy Stacy
2007 Alpine SE 40FDQS, 2011 Equinox
ACA & Alpine SoCal