Blizzard decided that they want to stop using the Battle.net name for their gaming services and all of the functionality that’s connected to it. Don’t misunderstand, Battle.net technology will still be the central nervous system for all Blizzard games, they are just changing the name, since having something with “Blizzard” in the title would be more fitting. This change was actually underway before this announcement, as you can see with recent examples with “Blizzard Streaming” and “Blizzard Voice”, so expect more changes in that sort of way!
It isn’t known why Blizzard even came up with the name Battle.net in the first place, as it is an online-gaming service that is supposed to be a launcher for Blizzard games, so they didn’t bother with the name much, and they just named it Battle.net. Today, the separation between the Battle.net name and Blizzard is starting to become more apparent, as they seem more like two separate identities, which is bad for business. They finally decided that they want to change that, and even though we don’t know what the new name will be, it will most likely have “Blizzard” in the title.
Announcing this change to their fans is really cool, but Blizzard has always been cool with their fans!