Viscount/Viscountess is now Count/Countess, Archduke/Archduchess is now Prince/Princess. These will take some time to fully convert everything to the new titles so you will see parts of them still show their old names.
As of right now the only things changed are the in game titles and the items in the kits. The commands to the kits have not changed. They are still /kit viscount and /kit arch.