And oh boy is it a big one. Turning on the Battle.net launcher automatically downloads about 14GB worth of StarCraft II code and content. The patch includes the new user interface that we reported on earlier, but it also opens the Whispers of Oblivion prequel campaign for Legacy of the Void to the masses, changes the file format of game content to CASC, which might explain the huge download, and gives the option of a 64-bit game executable, and more.
About the CASC format, it was introduced in Heroes of the Storm and Warlords of Draenor as a method of storing content. It should be faster, more error resistant, easier to patch, and easier to extend the functionality of. I'm not sure how this will affect modders, authorized or otherwise, but I'm guessing that Blizzard is happy to deprecate a 20 year-old format. I'm not sure if they're migrating the content from MPQ to CASC on the client machine, or just re-downloading the content in the new format, but a 14GB patch is doing something. Lastly, this new format and the 64-bit launcher might even allow for bigger games and mods. If anyone has any experience with modding Blizzard games, be sure to leave a note in the comments, even anonymously.
Legacy of the Void will arrive on November 10th.