Samsung Galaxy Alpha update to Android 5.0.1 to take place next month
The update to Android 5.0.1 will include Material Design, the 64-bit ART compiler for faster opening of apps, Project Volta for longer battery life, the new "Recent Apps" page, Lock Screen notifications, slide-down Quick Settings access from any page, security improvements, updated TouchWiz UI, bug fixes and performance enhancements.
Because of the hefty size of the update, when it does arrive, you should be using a Wi-Fi connection when downloading and installing the update. And make sure that your battery is charged to at least 50%.
source: @SamsungFR (translated) via YouMobile