Is Bork a heel or a face right now?

He's neither, has been neither since his return. His gimmick is that he has no gimmick, he's (as close to as possible in the world of fake fighting lel) his real life self. Brock Lesnar. Freak of nature. Legit fighter, former UFC heavyweight champ. He fights, he dominates and he (usually) wins.

is Braun a heel or face?

Bork is Bork. He's whatever he needs to be at the time.

He was a heel against Cena, against Roman, against Goldberg, he's a babyface against Joe and Braun. So on and so forth.

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A heel but is cheered and so WWE are utilizing that. Same with Bliss.

Brock and Strowman just float around. Reigns is a face that acts like a heel, and Joe is a heel that acts like a face.