On the subject of Nokia catching up, it's easy to say "go for a new interface" but it's not so easy to do when you're the market leader and your market share is growing. Nokia's phones currently make up 40% of the global market, more than double their nearest rival's share, and higher than they've ever been AFAIK. Their smartphones continue to outsell the competition put together. It's difficult for businesses in that kind of dominant position to make radical changes in case those changes cause them to fail.
This is why I think the tablets are the best way forward for Nokia. The tablets have a tiny market share, so it's the perfect place for Nokia to try new interfaces and other technologies. They get to play being a bright new startup, they can take risks more comfortably. As far as the tablets are concerned, Nokia is a small company again, which is a good thing.