Several Staves are now classified as Warstaves. Warstaves can no longer roll caster-related modifiers, while Staves retain their old mod generation behaviour.
Certain staff base types can no longer roll spell-based mods such as added damage for spells or increased spell damage. Their base attack speeds have been slightly increased, and their damage decreased to compensate. This affects all existing versions of these base types. (For a full list, see Version 3.7.0 § Item Balance.)