These changes aren't the be all and end all, certainly! We'll be sharing more changes going into this Ranked season as they're finalised.
Guardian is going to be receiving some changes in an upcoming patch. Until those have been made she won't be going into Ranked.
We're making some changes to Ranked Season 4. Have a read about the changes here and feel free to ask questions:
I wanted to post the patch notes a little earlier to give everyone a chance to digest them before the update on Monday.
Let us know what you think!