Samsung also says that those experiencing a problem with their handset after the Android 5.0 update might find their phone working better following a factory reset. If you do go this route, make sure that you back up your content. Samsung suggests syncing to your PC and using Samsung Kies for this process.
The tweet doesn't mention when these updates will be rolling out. The only advice we can give you is to keep your eyes peeled for the notification from Samsung that says your update has arrived.
source: SamsungMobileUK via YouMobile.org