The last set in Japan during the BW block was EX Battle Boost, which was indeed mostly treated like a concept pack, though this was before they started using the CP# numbering scheme and the abbreviation for the set was just EBB. It was mostly reprints with a few new cards, such as the Imakuni? trainer and the first Stage 2 EXes (Chandelure and Excadrill). EBB was put together with the Japanese Shiny Collection (SC) to form the English expansion Legendary Treasures, with the SC cards becoming the Radiance Collection mini-set.
It does indeed look like this pattern in continuing, as it's now several weeks since XY11 came out and there's been no word on XY12. However, there is
a concept pack that will be released in September, which is the month slated for the next "regular" Japanese set. We don't know a lot about this set yet, but presumably we'll be finding out more in the next few months. Because we don't know much about it, it's hard to guess if it would be suitable for the English November set. Since CP4 was more similar to EBB, it's possible that those cards will get reprinted then instead. It seems like a decent amount of the CP5 cards have already been released in English anyway.