Her snagged 5 including best film, Phoenix would have made a nice 6th nomination. Don't overlook this as one of those films that wins 2-3 Oscars including best picture.
It's so unusual and so well done. Those who like it really like it. Think it will appeal to a certain voting block and rack up votes whereas Hustle and Wolf split a similar voting block.
12 Year's a Slave? I don't know. All I hear in the media is it is so well done and not, "You have to go see this." Enthusiasm might not be there.
Gravity? Completely different movie watching it at home via a screener. Could hurt.
Think Her has a good shot. Jonze wasn't nominated but neither was Affleck last year.