Patch 12.1 launched on August 11th, with Season 2 launching next week on August 18th.
With Patch 12.1.5, the previously announced roadmap, notes that Patch 12.1.5 contains:
Labyrinths
New Raid
New Content and Systems
As of right now, the patch itself hasn't been updated yet which means no datamining of Patch 12.1.5 is possible.
If you don’t already have your very own Blizzard Account, now is the perfect time to create one. A Blizzard Account allows you to keep all your Blizzard registration keys (WarCraft III, StarCraft, Diablo II…) in one handy place, and to download your registered games when you need them from any computer you are using. The Blizzard Account gives you access to the Online Store, where you can buy Blizzard games and other products, including the Blizzard Authenticator.
Our new stock of Authenticators is expected to arrive mid to late September, and should be available for purchase on the Online Store at this time.
