Categories of @unikname have been replaced by a more simple concept: Patterns of @unikname.
Pattern determine the price of a @unikname. Very short @unikname using Latin letters are more expensive than long ones, because of their scarcity. Patterns are calculated during the issuance of the UNIK token. Patterns are publicly known only for @unikname that have been disclosed (their human-readable name) by their owner.
This feature is ongoing and will be in the next release.