I would be very surprised if we got Brief Lives. My bet is Season of Mists plus Fables and Reflections / Song of Orpheus. We can't have Brief Lives until after A Game of You, and there is definitely not time in one season for Season of Mists *and* Game of You *and* Brief Lives.
The other thing I’m thinking is … Dream is barely in A Game of You. Perhaps they might interweave some or all of Brief Lives in with it? Honestly they could do anything