Yeah I am also participating in it with 3 ideas of my own. The problem is the competition guidelines are quite vague. As far as I understood, they are asking not only for ideas to improve N9 UX but also how to improve smart-phones in the future, and other general ideas. That vagueness may be the reason for all those hardware related ideas.

My 3 submissions are
1. A seamless way to interact with multiple devices/platforms http://goo.gl/Dd5Kn
2. Improvements in caller-UI http://goo.gl/MJ3XB
3. Easier/Faster tab switching in N9 browser: http://goo.gl/xhSQs

I would be really grateful if my TMO brethren would view my ideas and if you like it then PLEASE "vote" for it(Vote means clicking LIKE button, after logging in with FB/Twitter). Also advises/suggestions/critiques are extremely welcome in the form of posts here or comments there.

The winners are selected by judges, but to be judged, we need to be in the top 15 based on votes/views. (that in turn means that if u view without voting too many times, my ratio will go down and I won't be eligible ). This is my only chance to get an N9 as it is not being released here in India, so I hope I'm among the winners...