The Release note states that-
Key updates include: Watch next! When you buy a TV series, we’ll show your progress in a given episode and highlight the next episode to watch Access search from within the app Bug fixes and other UI enhancements * Available in regions with Xbox Movies Store. To see which features are available in your region, go to the Xbox Video feature list at http://support.xbox.com/apps/windows-8/xbox-on-windows-features.
It supports x86, x64, ARM