
Sigma Austria posted a teaser on their Facebook page about a new lens that will be announced on February 23rd for the 2016 CP+ show in Japan. Here is the translated text:
There are already several new products announcements scheduled in the upcoming days and weeks ahead of the CP+ show in Japan (February 25-28): Panasonic (multiple products): January 19th Leica X-U Typ 113: January 20th Olympus PEN-F: January 27 Canon: first week of February Nikon’s announcement will be probably right before the CP+ show (compact cameras expected)