Good lord, why would they change this?
In Vista SP1, Microsoft disabled the ability to use the /console switch for logging onto the console session when using Remote Desktop. The ‘fix’ is to use mstsc /admin
http://blogs.msdn.com/dancre/archive/2008/03/19/mstsc-console-is-now-admin-in-vista-sp1.aspx
Nick's Blog 
A side note, I’m on Windows XP SP3 and I have to use the /admin as well, I found out today it won’t work with /console. It must be the latest version of Remote Desktop.
Lots of people, even the ones working on IT doesn’t understand what a “console” is, I think is that simple.