Huge thanks to Daniel for emailing me about this!
Hoshino has given in after many years of requests from German Ibanez distributor Meinl to build a 12-string Ibanez RG! Now, I suppose this will only be available in Germany for now, but who knows, if it’s popular enough and if word spreads far enough online, maybe it’ll prove to be profitable enough for Ibanez to make it into worldwide distribution.
Structurally the guitar appears to be based on the RG570 (albeit with a fixed bridge), with a humbucker/single/humbucker (Ibanez V7, S1, V8) configuration, 5-way switching, volume and tone controls, 24 frets and no pickguard. If the body wood is anything other than basswood I’ll eat my hat.
More info here.