It has been more than five years since Wings of Liberty was released, which itself was a long-awaited continuation of the StarCraft story. The first game and its expansion had their narrative cut into six episodes, three each, that were released all at once. The three episodes of StarCraft II, on the other hand, were decoupled into the original game and two follow-ups. The third and final one, which focuses on the Protoss, will arrive on November 10th, 2015.
Representatives from Blizzard have said, multiple times, that Legacy of the Void will wrap up the story arc for the main characters. The story may continue, but we should get a solid conclusion. The release date announcement came with a cinematic trailer, above, showing the Protoss holding off against the Zerg. There doesn't seem to be much story in it at first glance, but Blizzard is quite subtle about meanings. Some questions, like who exactly they are fighting and why, might be addressed in the story.
So that's what it looks like to them…
This announcement aligned with the finals of WCS Season 3, which is the last season before Blizzcon. Apart from the two sister tournaments in South Korea, GSL and SSL, there is just one Blizzard-counted tournament remaining, which is DreamHack Open in Stockholm, Sweden. WCS Season 3 was won by Lilbow, a Protoss player from France, which propels him from 18th place to
at most 8th Update Sept 13th @ 8:40pm ET (Part of the points were already accounted for apparently): 13th, minus a few positions once everyone's points are accounted for. Since the top 16 make it to the year's global finals at Blizzcon, this is enough buffer room to guarantee a spot at the tournament.