As you may know, Jolla is a project developed by former Nokia employees. The first Jolla phone uses Sailfish OS, a Meego Linux derivate and comes with interchangeble covers, allowing the users to easily change the phone’s appearance. It also has good hardware specifications and uses Wayland as a display server. More information can be found here and here.
Like Tizen OS, Sailfish OS also got support for the Android applications. The Sailfish phones and tablets already come with many applications preinstalled, both native Sailfish or Android apps.
We don’t know yet if users will be able to download apps from Google Play Store, Amazon Appstore or other Android application providers. The estimated price for Jolla’s smartphone is $510.