I love Joaquin Phoenix. I love Spike Jonze. We all love Scarlett Johansson. Throw them all together with an amazing soundtrack and a brilliant concept, and you get what I think might be one of the best films of the year. Check this out for a trailer:
I would be very surprised if this movie doesn't turn out to be incredible. Joaquin's gone from strength to strength; Walk the Line, We Own the Night, Two Lovers (which I loved), The Master...
Spike is Spike and he's pretty much unstoppable.
(Also, if Apple/Android/Amazon/Samsung/Whoever decided to pay Scarlett Johansson to be the voice of my phone, I'd buy that. Right away. Without hesitation.)