Hearthstone has a new adventure coming out shortly called One Night in Karazhan. It is a bit of a silly adventure thematically, since rather than spooky old magic castle we have ridiculous disco party night in the magic castle. Bizarre, but whatever, I care about the numbers. The thing that interests me most about this adventure is three cards in particular that interact with Secrets.
The overall picture is more interesting to me than the specifics though. These cards show that after the Mysterious Challenger and Mad Scientist debacles Blizzard is still interested in pushing Secrets, and they aren't going to make Secrets good on their own. They intend to leave them as is, which is to say they are marginal and occasional in Mage and Hunter (Freeze Mage is the outlier) but basically unused in Paladin. They only see significant play when there are Secret enablers that are powerful that let them do other interesting things. Both of the good cards above fit that description - they aren't as powerful as Mad Scientist, but they both really encourage using Secrets, and my feeling is that people will use them in competitive decks in exactly that way.
Back when Blizzard was setting up Standard and modifying cards I was concerned that they might simply decide to abandon Secrets and leave them as generally underpowered and uninteresting cards. Constantly putting out Secret synergy cards seemed like a thing they might not be interested in. I thought there was also an outside shot that they would buff Secrets a lot and stop printing Secret synergy cards, basically accepting that the Wild format would be ridiculous in terms of Secrets.
Looking at these cards I feel like their strategy is a good one. Secrets are going to be used sometimes, but not by everyone, and as the format rotates their usage will wax and wane. This is probably a good spot to be in. Wild will likely be absurd because Mad Scientist in particular is preposterous with Medivh's Valet, but that is pretty much what Blizzard promised. Wild will be unbalanced and silly, which I am pretty okay with.