At the end of the Orsinium storyline there was a message from the Prophet (whether or not he died near the end of the main story from the base game):
https://www.youtube.com/watch?v=2PBitc24Nsk
There will be a new storyline involving Vivec for the Morrowind Chapter of the Elder Scrolls Online, but, we know that the devs plan to continue on with a long-running plot that follows on what was laid down from the original main story and even who the major players are and what DLC will signal a major shift toward this new plot. It isn't something ZOS will cover in one new content release, so we can reasonable expect to see pieces of it over additional content updates.
Are you looking forward to having a larger plot thread that weaves together pieces of the new content releases? Early footage of Clockwork City and Mephala's Realm have been available for a good while, even prior to learning of the new main story extension:
So, here is my personal speculation.
2017Q2: Morrowind Chapter -- help Vivec avert a disaster, foreshadowing of the "war among the gods" storyline mentioned by the Prophet, with concern expressed at the end of the storyline about Sotha Sil (and his city)
Q3: Unrelated dungeon pack in base-game zone -- could be anywhere but Shadowfen
Q4: Clockwork City DLC -- holiday season DLC hype! The doors are open...the new war has begun. Explore the fabled Clockwork City as part of a self-contained storyline that also weaves into the larger context of the battle between the Daedric Princes.
2018Q1: Mephala's Realm DLC -- The war between the gods moves beyond Nirn as you venture to the heart of the Plane of one the conflict's main architect. That storyline takes center stage at last!
Q2: Murkmire Chapter -- Fallout from the last storyline in the background that explains fundamental changes to aspects of the game and a new class, a new self-contained story, and the start of the next main story cycle...
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