According to the challenge calendar on ZI, the workout of the week is expected to be Escalation. However, i have no card for it on my zwift home page. Under challenges, I have an old card for the Rolling with Enve races that has not gone away. I have a card for Ziwft unlocked, Zwift Camp: build, Big Apple Badge Hunt, FTP Check, Climb of the week, and Route of the week, but no Workout of the Week.
I typically run Zwift on my iPad, but checked to see if this is only on IOS by also running Zwift on my PC and my home page looks the same on both devices.
Marty