The presentation Will Wright did at that GDC conferance has been released.
And it looks FANTASTIC.

http://www.planetspore.co.uk/ff/videos.htm

Its a big download but quite worth it. (First 10mins is talking, so if you want to skip right to the gameplay you can skip the first 10mins)

Edit: Direct link: http://www.sash.simvision.net/Spore.zip

Cheers for the info!