What's Louis' brother's message for the Brat Prince?

The Vampire Lestat episode 7 sets up Interview with the Vampire season 4 by examining Lestat and Louis' failures and their love. They are the key to saving the world.

Sam Reid knows your head may well be "rolling 'round" after that dizzying finale of "The Vampire Lestat" Season 1.

The who, what, and when will we get more?