Ah they changed it now https://playhearthstone.com/en-us/cards?set=scholomance-academy used to show 14 revealed cards and 122 cards backs but now it’s 135 total.

So I guess I shouldn’t have trusted the official website ????

On playhearthstone.com there are 136 total cards, so I’m guessing it’s the correct number since it’s the official website

Reddit says March 17th :/

https://www.reddit.com/r/hearthstone/comments/fgqrsu/march_17th_a_storm_is_coming_new_expac_hof_new/?utm_medium=android_app&utm_source=share