According to aLoL website Azir relies on his minions for raw damage, while using spells to "manipulate his and his soldiers’ positions to keep him safe and establish dangerous no-go zones for his enemies"over on the
So obviously directly controlling a horde of soldiers around the battlefield would be something of a hassle. To solve this problem, Riot has made it so that his summons require "an active input. Azir must right-click and go through a basic attack animation for soldiers to do anything. This makes both Azir and his enemy understand that a conscious command was given to the soldier. This also means that if Azir is stunned or running away, soldiers cease to be a threat. All of a sudden, Azir’s opponent can comfortably aggress."
Essentially, rather than dragging his minions alongside him, Azir uses them as extensions of his own attacks. Though obviously he has a couple of special moves to make things a bit more interesting. From the look of it he'll be a little tricky to use if you're new to the game.
There's no release date set for Azir just yet.