2013’s Heart of the Swarm introduced and expanded on the concept of customising your army around super units, whilst ramping up the cinematic qualities of each mission and set piece.
But perhaps the most impressive StarCraft II change came in the presentation and progression of the subsequent Zerg and Protoss campaigns. And even some noticeable visual stuff too.
Since the release of Wings of Liberty in 2011, the StarCraft II franchise and core multiplayer experience has seen a number of improvements - from the usual new units and structures through to new modes and several interface changes.