Microsoft is hard at work developing the UWP Apps for Windows 10 and Windows 10 Mobile. Now a new Store UI (Appx) has leaked online with UI changes and a new version.The App is bumped to version 11605.1000.149.0. These New UI changes have not been confirmed by the Company, hence take this with a pinch of salt.
The Store UI (Appx) is available for both Redstone and TH2 users , but since this is not an official update install it at your own risk.