The start of filming was originally set for 20th January although David Tennant would not be involved in the first week of filming as he does not finish in Richard II in London until Saturday 25th.
No reason is given for the postponement (but this is not unusual) and David may still not start filming until the second week of the shoot.
Also today the Times Colonist has an article about Gracepoint filming which starts with the question 'Is there any actor in Hollywood who will not be working on Gracepoint when Fox’s 10-part remake of the British crime series Broadchurch starts shooting here at the end of the month?' It also uses the phrase 'a cast already top-heavy with big names.'
The article states that Gracepoint will shoot in locations from Oak Bay Village to the Saanich Peninsula 'with the region doubling chiefly as the sleepy coastal California town of the title where the murder investigation takes place.'
YVRShoots original article (from 21st December)
Times Colonist article
Gracepoint section of DavidTennantOnTwitter.com