Now, version 1.4 is expected to be available as soon as Tuesday and includes a new UI. Those installing the app can choose from the current UI which is being called Polaroid, and a new swipe/gesture interface called "Modern." After the app is loaded onto your Windows Phone, go to Settings and then General and you will have the option to toggle between the two interface options. While using the Modern UI and scrolling upward, the navigation bar on the top of the display disappears leaving more real estate to view a picture.
6tag is available from the Windows Phone Store as a free download.
source: 6tag via WPCentral