The Ahsoka rumor is 100% false,
I don’t think 5 news outlets confirming it and an implied confirmation from the actress herself counts as “100% false”.
and nothing from Lucasfilm has actually confirmed the Boba Fett and Bo-Katan stuff.
Yeah, that stuff is kind of shakier. But Lucasfilm is notoriously secretive, and Boba Fett and Bo Katan would just make sense given that the show is called “The Mandalorian”. I’m expecting the second season to dive a lot more into Mandalorian history and culture, and feature a backdoor pilot episode for the Rebels sequel.