Phil has an interview at Unity on the 2nd.

Ideas for the asset store? More content! High-quality spaceship models, especially modular, would sell like hotcakes. I'd also say game starter kits, but they would have to have really clean, well-thought out and high-quality code... and it seems most developers who write content for the Asset Store don't write it it for others, or at least with others in mind.
Whatever you do, just remember that you'll need to support it. The more successful it is, the more support you should be prepared to give.