This post from road.cc covers some of Shimano's upcoming offerings. Road.cc originates in a charming-sounding place called "England," which seems to be a lot like South Carolina except they say "chainset " instead of "crankset" . . . surely that's the only difference, right? Anyway, the post focuses on the forthcoming Tiagra group, which is :

1)Transitioning to 10-speed [insert wistful sigh or celebratory whoop here].