A new trailer showed how Mauga became the big tank he is as well as his past activities with Talon.

Source: https://gamerant.com/overwatch-2-mauga-origin-story/

For many, the biggest announcement was the reveal of Mauga, a new tank character arriving in a couple of weeks.

Source: https://gamerant.com/overwatch-2-bug-trap-players-invisible-box-colosseo-map/

For one thing, they can look forward to the official release of new tank hero and former Baptiste ally, Mauga.

Source: https://gamerant.com/overwatch-2-season-9-major-changes-ranked-rework-emerald-weapons-ultimate/

Mauga has already proven to be very popular not even a month into his official release, as not only is he a well-designed character that enhances the game's diversity, but he's also just a really good tank to play.

Source: https://gamerant.com/overwatch-2-mauga-ultimate-lifeweaver-combo/

The store page also reveals Mauga has a pseudo-support ability called Cardiac Overdrive that “engage both of his hearts” (weird) “and create an aura that reduces incoming damage, allowing allies to heal themselves while dealing damage.”

Source: https://kotaku.com/overwatch-2-tank-hero-leak-blizzcon-1850990142