"What Comes After" for Matt and Tuon, specifically the re-taking of the Seanchan continent for the Empire, was to have been the plot of one of the Outrigger Novels that were discussed. In a recent chat, Brandon said that there has been discussion of him doing the other 2 prequels and the Outriggers after the Encyclopedia is released, but that he's opposed to it personally. He thinks they should stop after AMoL, but would continue through the prequels and Outriggers if asked to do it. Personally, that's the only Prequel/Outrigger I'm really interested in reading.