Was going to update the list, but not much has changed really since December. The new guild guardians were good for several legendaries, most notably Sekhma and Taloca. But I don’t think they were improved enough to change their tier standing; that said, I’m open to arguments to the contrary.
We also received Krampus and Captain Macaw. I would start them both off in C, as they are both gimmicky instakill troops (albeit better than the last one we received, Dullahan). Krampus is one of the more reliable instakill options, with a 2/3 chance of a good outcome, but its risky to cast him on damaged troops, as you could replace them with a full-health demon.
The newly-announced Darkstone Mythic could change the equation for Captain Macaw; she is rogue-type and looking really strong. Even though Macaw’s tools don’t complement her at all, 50% start alone would make Macaw instantly relevent, even if his spell never gets cast.