new article from a japanese hobby magazine
and the associated translation
Transformers Masterpiece line is reborn! Cybertron Leader spotlight!
>[Masterpiece Convoy] series starting June 2013
>"People love Convoy, he is the most sought-after figure in a lot of lines and the Masterpiece line is no exception that is why we think it is time to transform the Masterpiece line concept into something people will love even more" says TakaraTomy Marketing Team Producer Noriaki Maeda. "People want more Convoy and we want to offer the best products" those are the words describing the new Masterpiece line direction. Get ready for the ultimate Convoy figures with better looks and a wide variety of gimmicks. When asked about the other characters, Noriaki says "We plan to release 3 to 4 Convoy figures a year, each time with new gimmicks, new sizes, different iterations of the Generation 1 design, we know some fans would feel disappointed knowing they will never get a new Masterpiece Megatron or Meister but in all honesty, they won't have much time to think about that thanks to a completely new Convoy figure getting released every 3 to 4 months". With this being said, let's make an appointment for June 2013 to discover the first [Masterpiece Convoy] release.
tl;dr: they will release 4 Optimus Prime a year in the MP line and nothing else.