News from Mix09 appear to indicate the Windows Mobile 6.5 app store will be much more full features than initially suggested by the place holder web page.
From the slides we can see MarketPlace will support all the features expected for modern on-device software store. Users will be able to buy applications from the device or the desktop. They will also be able rate and review applications, the service will provide automatic updates to installed applications and users can re-download purchased applications onto another device.
Payment will also be available via credit card and not just through operators.
See the full presentation here.