Mac App Store announced

Today Apple announced a Mac App Store. A cool idea and I think no Mac developer wants to be outside. The service fee is quite high with 30%, so you'll certainly want to make additional sales outside their store. But this raises questions:

For example what does Apple define as a minimum level of an application?
What must I comply to? support as minimum?
Do they want a clause in the contract that their price is the best price available?
How would we handle updates? Especially as some apps come from the store and some not?
Can we query in our app the status whether we are installed by the store or do we have two binaries?
Does Apple test our apps and check quality?
Do they limit our possibilities?
Is maybe Carbon not allowed?
Is my application rated 18+ if I offer some browser window?
Can I use libraries/plugins? Do I need to provide license proofs or information on those libraries?

A lot of questions and we'll see how things will work out. Having a central store is a great idea and I hope I get my apps more visible to millions of users :-)