Personally I care far more about the heroes actual mechanics than I do who they are. Character aesthetic, voice acting, story. All those things are the garnish with the characters actual kit and how they fit into the game being the main dish.
I have no strong preference for whether 31 is Mauga, Sojourn, Liao, Maximillian, Lynx 17, Nguyen, Echo, Junker Queen, Sanjay, or anyone else I’ve forgotten.
31 could be anyone. Sure we’ve gotten the most detail about Mauga and the Storm Rising Omnic has been lurking ominously in the background for a while, but characters being teased and characters being released aren’t necessarily connected.
Baptiste, Ashe and Wrecking Ball basically came out of nowhere. Apart from a letter which talked about Baptiste, in far less detail than Mauga mind you, all of these heroes were complete unknowns until they were released.
Orisa wasn’t described in her tease. Only Efi and Doomfist’s breakout.
Doomfist was teased, albeit in Orisa’s tease.
Moira was just released with no real tease. IIRC she was edited into the the Masquerade comic after she was revealed.
And Brigitte wasn’t really teased, but has been a long time supporting character who we’ve known existed since OW’s launch.
Point is, getting your hopes up on Mauga or some other teased character just because they’ve gotten some detail is kinda pointless. If 31 was teased in Baptiste’s story, it’s just as likely to be one of the clinic doctors or “unnamed goon #5” as it is Mauga.