Well, to be considered "a first" in a mobile phone camera, there are only few things that comes to mind that will be useful:

1. Fast continuous shots. Possibly 2fps+ full-res burst mode and 5fps+ @ lower-res.
2. Take photos while recording a video. (not as useful/amazing)
3. Infra-red night vision (but N9 doesn't have IR LED's...)
4. Super high ISO support e.g. ISO 6400 (umm, VERY unlikely)
5. High-FPS slow-motion video recording. (maybe like 120fps?)
6. Full manual exposure control (but N9 doesn't have variable aperture lense?)

There are few others but I already know the answer to it or it's just technically not possible on the N9. (and some stuff I haven't even thought of) So yeah, I would say #1 is the highest probability. No idea what other phones are capable of but I don't recall a phone with faster than 2fps+ full-res continuous shots. Do you? If not, #5 is possible also. I guess it'll be useful for golfers like me as you can record your swing and watch it frame by frame with much more detail. Anyways, this is all just a wild guess BTW.