Okay, finally made up my mind on this:
-Moënghus, because I'm very curious to see how he'll cope with the events of TUC (he was still concerned about Kayûtas and Serwa's well being at the end, and likely has no idea what happened to them...), living among the Scylvendi and dealing with Cnaiür's legacy.
-Other - the Mutilated, I really hope we get the POV of at least one of them (whether they're really Shae or not). There are definitely many interesting things to be told there...
-New characters - I would love to get a POV from a) someone in Zeüm (preferably Likaro) and/or b) Nersei Miramis (Proyas' wife). Hopefully both. I know these could both count as "Other - returning characters", but unlike the Mutilated, we've only heard mentions of them, we've never actually seen them on page. So I'm counting them as "new".