It's possible Spock is still betrothed to her, provided she's still alive. However, since originally Spock didn't go into ponn farr and return home to marry her until 2267, there's no reason to expect this to happen before then in this timeline either.
It's possible Spock wouldn't break things off with T'Pring before seeing Uhura. As he got to know Uhura and things developed between them, I doubt he considered the person he ahdn't seen since childhood. And since T'Pring could very likely already be devoloping a relationship with Stonn anyway...