Since Conley Woods essentially wrote the article that I’ve been mulling around in my head, instead of posting a rehash here I’m just going to go ahead and point you to his article over on Channel Fireball:
Chins up, blue mages! Have confidence! While we may not have gotten the versatile counterspell that we wanted in Worldwake, as Conley points out, we did get a plethora of options for library manipulation and card draw. This should help to bolster blue-based control strategies a good deal. For those of us who bravely weathered the storm, it’s an exciting time to be playing blue!