I am sure they can figure it out, but I don't think they will ever go thicker again with the iphone. With that being said if they add things like NFC, notification light, or some kind of Apple widget thing you are talking about some battery drain even in standby. I think the IGZO screen could help, but then adding the features could pull it back down again. Like I said Apple is smart with this kind of thing, but these are reasons I don't think we will see anything like these festures in the iphone this year maybe not even next year. I know the battery technology is growing all the time but I don't see a great change in the coming year.
From what I've read, IGZO will be a great battery saver - and Apple's implementation of such features wouldn't be the same as Androids. Apple has a much tighter reign on the optimization of software and hardware since they control both. They would likely only implement these features if they can keep the battery life high and efficient.
Maybe this year, maybe next. Maybe something totally unexpected. Who knows? Exciting to think about though.