KCNC, the component company, has road 12 sp in their 2012 catalog. There are pictures of 12sp cassettes, and drawings of new derailleurs and shifters. The cassettes fit on current Sram/shimano freehubs. No chain is shown. They did not show 12sp at Interbike.

Would you get 12sp if it came out?

I would love to have more gearing choices. But I'd probably wait to see if it was reliable first. KCNC makes some innovative parts but they sometimes don't perform as well as I would like. And I have a stash of 10sp stuff so I'm in no hurry to make it all obsolete.

They also have MTB 11sp in the same catalog.