Zed is apparently free this week, but he is not in my roster, or playable at all for me! I wanted to try him out this week!
I noticed Evelynn is still free, even though she was free last week. I have her still, but not Zed. I bet its connected.
Zed is not playable on free week for me, but Evelynn still is, despite her being on free week last week. Bug.
EDIT: Zed is now playable, I guess it was just a weird thing that happened to quite a few people at the beginning of the patch. I asked other people in game lobbies, they said they had the same issue. Its fixed for me now, thanks!