Blizzard announces the release of a new patch for Heroes of the Storm, offering these patch notes for the new version. This introduces the new Lunara hero, and this page has details on the new character. The new version also introduces their first pass at an improved matchmaking system, and this article has details on how that has changed. Here's a bit:

As a result of these changes, the Heroes matchmaker will now much more effectively group you with allies and opponents that have very similar matchmaking ratings (MMR) to your own, creating games that are fair for both sides. This will also affect Ranked play, and you may notice that all players in your Hero and Team League games are much closer in terms of Ranking. While initial data from live games indicates that we’re well on our way to accomplishing these goals, we’re going to continue monitoring the new system and make additional improvements as necessary.