So far that I know of... there are healing and mana potions that you can find/make, and there is a spell that puts a character to sleep and he recovers health/mana much faster (but he's out while that happens). There are also some archetypes that regen faster (healer mage I think regens mana faster). Not sure if any stats affect regeneration, as this is something that's very different from the PnP version (I think in PnP you recover 6 mana points per *night*)