From what I can see, I believe TBL, considering the market demand and thus their lead in the 1/6 seamless body market, are taking the lead (business risk) in testing out other sizes and scale (ie. 1/12 too) and watching the demand from us collectors, and if other relevant companies will follow up with head sculpts to match. It would be really helpful if some one could produce neck connectors to match 1/6 HSs to the S24 to S26 size bodies. Meanwhile, we are relying on blutac, plastic wrap, styrene packing wrap, etc, to make it work.
The 1/12 scale figures seem to be catching on more it seems as other companies are diving in to release their offerings.