No - it will not have an app store - it will have MANY app stores.
And I don't consider this a good thing. If you look for a certain application, as a user you have to check a dozen different stores to see what is available for what price - the prices for the same app might not even be the same on every store. Than they might have different payment systems, whom do you trust?
I'm sure that at some point the will be apps that function like e.g. nextag to search all the stores at once and give you a comparison with price, app rating, store rating, .... etc but honestly: does not sound attractive to me and probably not to the none technical users. I like the one-stop-shop with trusted payment system and review system.
AFAIK, even though some device makers/carriers are implementing their own app stores, all the apps are available on the Google Marketplace app.