Sources and context are important. This is a slide taken by a public presentation made last Thursday in the Nokia Capital Markets Day 2008.

Not a leak.

The slide belongs to a presentation of David Rivas, Vice-President, S60 SW Technology Managment.

Note: I was just as curious as you about the slide since I didn't know about it. I found the source through a search starting from http://maemo.org/news and the blog post from JS Manrique - http://omag.es/blog/2008/12/06/new-conceptual-maemo-ui/ . In cases like this it's worth checking maemo.org and doing a little research.

EDIT: Ah, chlettn found also the link while I was writing this post.