IXFD64 they stated that it would be converted so im not sure what that implies.
as for necro energy that seems viable as "divination" is part of necromancy in most lore. its not the same divination we have in game but im sure itll be similar.
pssst....we know who you are. Hail Sithis!
Well, I just got a login message saying it would be converted to a specific energy type on June 5. So from what it looks like, cursed energy has already been made untradeable, and will be converted to the highest tier of energy the player could obtain, based on their Divination level.