Blizzard Entertainment deployed StarCraft II: Wings of Liberty patch 1.3.0 into live servers.
This patch is gigantic in the StarCraft II Editor and Bug fixes side. Barely a handful of balance changes. The Leagues and Ladders feature has been polished. Blizzard added a new Grandmaster League which represents the Top 200 players in each region.
The Join Custom Game, Observer and Replay UI and Game Options features have considerable changes. Blizzplanet has the complete patch notes.