Anyone that has an account directly with us, with a dev license on their account will be able to log into the marketplace and add and manage their own extension listings. The listings can be commercial or free, and can link directly to the download or to an information/order page.
It will not be ready by Nov 28, but the UI design is completed, and the code is well underway.
The Marketplace will not yet tie into Blesta directly, meaning no automatic download/install from Blesta but that is planned for the future. For now the marketplace will be standalone and people can browse, search, filter, rate, download, click to purchase from the developer (on their site), view information and screenshots about an extension and more.