If you’re one of the many Telus customers with the Galaxy S6 then you should be receiving a notification that the update to Android 5.1.1. has arrived. This is the same software Rogers users reported last week and comes in around 475MB.
According to the description, Samsung notes that there are “new and / or enhanced features,” along with “further improvements to performance.”
If you don’t already see a prompt asking you to download the update, you can manually check for it via Menu > Settings > About Device > Software Update > Update.
Related: Samsung Galaxy S6 Review
(Thanks Mahmoud, Chris!)