It's supposed to be open for anyone who gets an invite.  Dan Farr even said over at DAZ that anyone who wanted in should IM a PC member and ask for an invite. 

Maybe you need a DAZ account (non-PC)?  It's set up so it automatically takes your info from DAZ.  All you need is the e-mail address you use at DAZ.

My other invites went through.  I see the one I sent to BAR-CODE as "pending."