Straight from bethesda's website:
https://bethesda.net/#en/events/game/fallout-4-add-ons-automatron-wasteland-workshop-far-harbor-and-more/2016/02/16/77
At the bottom of the article you can sign up for a free dlc beta. https://account.bethesda.net/en/settings/beta/fallout4dlc/signup
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Anyone planning to get the season pass or the dlc in general needs to buy the season pass now. The current price for the pass is $30, but after March 1 it is increasing to $50 because they are making more dlc than they initially planned. If you buy it for $30, you still get everything. Don't get burned by waiting around!