*awkwardly butts in to conversation*
Personally, I think Brandon will probably continue with the Bestower's Lenses stuff (if the 5th book ever happens). I could see him continuing on the idea of Alcatraz giving his Talent through the lenses. Who really knows, though?
I do think that there's a chance that Bastille will somehow become Oculator-y, simply because of how vehemently Alcatraz denies that it will ever happen. Because, as we all know, Al is a liar.
*awkwardly leaves conversation*