Each of the Chrome artists tweeted on the 20th, "2014. 12. Coming Soon~," along with the image you see above, which has the words, "2014 Chrome Family: A Very Special Christmas".
The Chrome family recently got together for '2014 First Chrome Family in Japan Concert' last month, and it seems they'll be teaming up again for this upcoming holiday project, which might mean that a fun carol is in store.
Stay tuned for this holiday treat!