I was initially hesitant to be too critical of the beard because I didn't want to look like an fool for over-reacting if it ends up that he shaves it off early on. I wouldn't put it past the producers to show only bearded Spock in the trailer, even if it's the only scene in which he has it, partly to generate buzz for the season and partly to punk their critics for rushing to judgment. That promo shot that you posted supports the fear that it's the character's permanent look, though.
I see this as driven by the same motive that gave us bald Klingons. They want to re-use the familiar, but put their own twist on it to make it their own, even if it bothers some fans. Besides doing it for selfish reasons and because they can, I wonder if there's also pressure to make the familiar elements just different enough that there's no confusion over who owns the images. After all, the beard definitely differentiates him from every other version of Spock, and the new Klingons look similarly distinct, so it would be clear which rights holders were ripped off if we should see them elsewhere (ex. if the folks selling TOS or Abramsverse toys were to sell a toy of a bearded Spock, trying to cash in on Discovery).