That's the link.

As to how many sets Artbox will release, the answer is probably as many as it can.

In 2007, we had 3D Series 1, OOTP, and OOTPU, plus SDCC exclusives. This year, there would have been two full sets if HBP hadn't been delayed. I wouldn't be surprised to see a filler set by the end of this year or the beginning of the next.
HP is Artbox's most successful and biggest license. They have 24, but it's not as popular as HP. I honestly don't know how it stays in business without any other big licenses.