However, this bug won't actually be fully resolved, since I think most users would rather see the default KDM interface than the 'Circles' theme (remember that you there would no point to enabling themes without specifying one to use, or users would have to edit kdmrc anyway, and Circle is the only one that the kdm package ships).
We could add a nice Debian inspired theme as the default one and/or enable it by default. Many users don't even know that there is a new and more beautiful mode for their login manager! If you are interested for a new theme let me know and I'll create one.