All cups will start this week, except for the 1on1 Duel Cup - which has a little delay. I asked the supervisor about this delay:
Kaboom wrote: This week, we had some trouble with finding a co-supervisor, that's why there is a small delay. If everything goes according to plan, we only will be down 1 week, which is np since the groupstages aren't that long anyway
If you want to participate but missed the signup, I´m sure the admins are happy to find someone for eventually drops.