They're only available for people going to the con. They order them online and pick them up there.

It just seems to be how they do things lately. SDCC version comes first, then playline later on. I imagine she'll be like Katana and get a later release, but if she doesn't, at least she exists in some form. I'm worried about them changing the styles when the full cartoon comes out, so I'm thrilled to have her before that happens.