Amazon.com today confirmed plans to launch its own app store for mobile devices running Google's Android operating system, inviting developers to sign up to offer their apps through the forthcoming store.

That wasn't a big surprise, given the rumors that first started to surface last year. What was particularly interesting was this new wrinkle, from the standard distribution agreement for developers using the store. "We have sole discretion to determine all features and operations of this program and to set the retail price and other terms on which we sell Apps."

TechCrunch has more details on that unusual approach, explaining that developers will submit a list price but Amazon will "use a variety of market factors" to determine the industry price.

Developers will get a 70 percent share of sales from the app, in line with other app stores, and they're guaranteed no less than 20 percent of the list price if the price set by Amazon is markedly lower than the list price submitted by developers.

Amazon isn't giving an official launch date for the new Android app store, other than to say it will be sometime this year.