Broadchurch 3 starts in February in the UK
ITV posted a very quick trailer for Broadchurch 3.
https://www.facebook.com/ItvDrama/videos/1214409538614891
It has two lines from Thomas Hardy's Tess of the d'Urbervilles superimposed over the cliffs to start.
They've also released officially that it will be back in February on ITV. They have a Monday night show running from Jan. 2- Feb 20, so the smart money is on Broadchurch 3 starting on Monday Feb. 27 at 9PM.
I have my fingers crossed that many other countries will get it the same week.