See [1] for an explanation of why pkgng isn't useful, especially the April 30th update: "...Port managers are currently working on introducing new-style (as known as "pkgng") binary packages in the coming months, please check the FreeBSD ports announcements list for further gradual status updates."

[1]: http://www.freebsd.org/news/2012-compromise.html

It works fine, but there's still no official repository.

Maintaining your own or using a third party is possible, but that's more of a temporary fix.