The new Learn icon will take you directly to the M365 Learning Centre without you needing to leave Teams. If you've had other apps pinned to your Teams menu, then you may find that following the new Learn icon appearing, one of them no longer shows. Please don't worry if this happens, the app will still be there for you to use through the more options icon (...). The reason that this may happen, is that the Teams menu has a maximum number of pinned apps that it can show at any one time, depending on the size of your screen.
To tie in with the new Learn icon, also from Monday 9 November, the name of the M365 Learning Centre desktop icon is going to change to M365 Learn. The desktop icon will remain the same and you will have the same useful Microsoft guidance and videos, as well as an abundance of interesting information including news, upcoming events and Teams Week recordings.