There's this proposal for a new S.E. site which is about to enter the beta phase.
It reads
This proposal is in: Commitment
A successful site needs people to commit to use it. This proposal is 100% complete. Committed users will be invited to the private beta soon.
I'd like to participate in the beta but I don't want to commit (due to a full name being required).
Will I be unable to participate in the beta if I don't commit?