Is Boba Fett alive in the new canon?

According to the Boba Fett Fan Club, the LucasFilm Story Group brought up Fett at Celebration Anaheim in 2015; according to them, he's Schrödinger's Fett:

"Boba Fett is both simultaneously alive and dead in the Sarlacc."

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What Pablo [Hidalgo] meant by the quote, as explained by further context of his point during the panel, is that Lucasfilm's Story Group has not independently decided one way or the other that Boba Fett is alive nor dead after the fall in the Sarlacc Pit.

However, Fett appears as a playable "Hero" character¹ in the recently-released Star Wars: Battlefront video game:

However however, since the canonical status of Battlefront is "complicated", that may not necessarily be a confirmation of his survival²:

• Vader and Palpatine are also playable heroes in Battlefront, despite them not appearing in some of the playable maps, and being dead for others (like the Battle of Jakku DLC map)

• Similarly, Fett is playable in some maps where he, canonically, does not appear; Hoth, for instance:

  

I haven't played the game, so I can't comment on the situations where Fett appears.

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¹ Battlefront games are typically multiplayer shooters, where you play as ground troops: Stormtroopers, CLone troopers, CIS droids, Rebel soldiers, what-have-you. If you collect enough widgets, you can temporarily play as a main character from the films, with different powers and higher stats, who is associated with your faction. The most recent Battlefront game (the one I'm talking about) has six playable Heroes

² Hat-tip to Tom.Bowen89 for bringing up these points

A set of Madalorian armor which is implied to have been Fett's is seen in Star Wars: Aftermath

From the box, he withdraws a helmet. Pitted and pocked, as if with some kind of acid. But still-- he raps his knuckles on it . The Mandalorians knew how to make armor, didn't they? "Look at this," he says, holding it up. "Mandalorian battle armor. Whole box. Complete set, by the looks of it. Been through hell and back. I think my boss will appreciate this."

However, this doesn't necessarily mean that Boba Fett is alive, just that his armor somehow made it out of the Sarlacc. (He could have died afterwards.)

In Star Wars: Aftermath -life debt- there is an interlude on Tatooine where they talk about how the Sarlacc became partially exposed after jabbas barge crashed around it. And that Jawas have been cutting into and looting the creature. It is possible that he could have been freed this way and that is likely how the Mandalorean armor was also attained. Whether he was alive when found or not though doesnt get explained. Though at the same time they reference finding skeletons. But at the same same time there is no way he could have been a skeleton if his armor was stil intact and as referenced it takes a thousand years for the sarlacc to digest.

In the (Disney Canon) series The Mandalorian, Boba Fett is indeed alive, however we do not know fully how he escaped the Sarlacc.

He makes his first appearance is S02E01, Chapter 9: The Marshal, at the end of the episode in a quick cameo.

Retroactively, we also saw his feet, cape, and arm in the closing moments of S01E05 Chapter 5: The Gunslinger.

He is then fully introduced in S02E06, Chapter 14: The Tragedy, fighting along side Din Djarin.

Boba is being played by Temura Morrsion who is the same actor that played Jango Fett in the prequel trilogies. Since Boba is an unaltered clone of Jango this makes good sense.