Best complain to bethesda, they were the ones who promised castle upgrades and never gave it....just like another company I know called liarshead, sorry I mean lionhead. XD
I hate people who promise things and never live up to it, you should never make a promise you can't keep.
If they meant that some automatic furnishing happens then they should have said that instead of "upgrading" because you never get the choice to upgrade, only choice you get is the courtyard passage way.