Wow, I've missed a lot in the past few days....
First of all, happy birthday, Ichi! Hope you had a great day!
Secondly, I do really want her to release "Water Under the Bridge" as the fourth single if time allows. It would be a shame for it to not get released at this point. Three singles is not enough.

And if she doesn't do this movie song, it would work out because she'd have a song to promote the live DVD. (But the thing with that is that the tour concludes in November, but if she adds dates, the DVD will be out before the tour is over. I would imagine the DVD will be released around the same time as the Royal Albert Hall one for holiday sales.)
Lastly, she needs to work with Paul Epworth and Tobias Jesso Jr. for the rest of her career. I love Ryan Tedder, and I love everything she's done with him, but I won't be heartbroken if they don't work together next time around as long as she keeps Paul and Tobias. I'm kind of indifferent about Danger Mouse. I'd love for her to work with Dan Wilson again. And I'd love for her to write with Sia again; if they did something like Sia's early stuff ("Day Too Soon"), I think it would SLAY.