The Nokia N9 website is here: http://swipe.nokia.com/ Go have a look, watch the video!
See also the Nokia N9 user interface guidelines (which shows how you use it, and what makes it different).
I have a Nokia N900 phone, and the N9 is the next generation. It looks to be the phone that has the polish that the N900 always deserved but lacked - great hardware in the N900, but the system software always felt unfinished.
However, this brilliant phone, a genuine iPhone and Android competitor, comes just months after Nokia announced it was putting its energy into 'Windows Phone' - which the N9 doesn't use. The N9 could be Nokia's greatest phone ever, but also already the last of its line. Engadget put it so well - read their editorial.
To add to the confusion, there are suggestions that it may not be available for another 6 months! Nokia has been criticised in the past for announcing phones too early, and leaving customers waiting too long for its new phones to arrive. Have they just done the same again?
I'm not going to pre-order the day after launch, as I did with the N900 (not that I think you can in any case), but I will be watching, seeing how it goes when people have had a chance to do some real-life reviews. I love the look, and the way it works, and I hope it's a great success. But it's a curiosity all the same.