Warning, the following blog may contain spoilers, random theories, and science.

OK, many people have been wondering if the Inika will transform in some way, and I say they have to. We know from Scholastic that the next place they go may be underwater (Power Play seems to suggest the part of Voya Nui that sunk into the sea), and what do the inika all have in common? lightning. What happens when you mix an underwater world with lightning? bad things. If everytime the Inika try to use their elemental powers they end up shocking everyone around them (maybe including themselves) then they won't be too keen on using them. It is possible that they enter some kind of giant bubble or something, but what's the point of being underwater if you still keep your feet dry? I forsee the Inika trying to face this problem in the first book of next year and being transformed by the next. While it could make for an interesting story to have them constantly afraid to use their powers, I think it would wear out quick.

Also about where the Toa Nuva are. Brutaka's mask power allows him to make poket dimensions and so forth so I figure they are in there, though the fact that some beings once sent to the shadow dimension (or whatever it's called) appearing in the last book of the year makes me wonder if they weren't sent there. It's actually a pretty niffty way of disposing of some characters, send them to a different plane of existance. And since Brutaka isn't turning good anytime soon then expect to see some force used to retrieve our heros.