We generally get something released each month. However, the schedule of upcoming sets ends at July, and GBT12 is unlikely to be out until at least September, which begs the question: what will be the release for August? By then we'll have already had moemaids, FC17, this season's LD, and support for all the prominent characters in Next.
So, let the wild mass guessing commence. My money's on something we haven't seen for a while: a tech booster, most likely featuring MC (haven't had support this season), AqF and Spikes (only clans not yet represented at U20).