Legacy of the Void's oddest feature, for me, is co-op. It came somewhat out of nowhere, as something that nobody was particularly asking for, but with classic Blizzard quality is something that seems a natural fit for the game once it's implemented. The development team had promised to expand it regularly, and that has already begun with a new commander and map being teased.
StarCraft II remains one of the best strategy games ever made.
The new commander, Karax, is the ship's engineer from the single-player campaign. He uses lots of laserbeams from space to destroy his enemies and has been repeatedly teaser on the official StarCraft Twitter account over the past week. Here's the best space laserbeams: