I’m relieved to hear that the group will be promoted. 3 years is a fairly long haul as ensigns, even on a second tier ship. The humour and credibility would begin to wear a bit thin if they at that rank throughout the show’s run. (… yes, I know about Ensign Kim and that was inexplicable - he should have been given an acting promotion to lieutenant at minimum.)
It’s interesting that TrekMovie has this article up before the news release has been posted. (I checked the Paramount+ press site and the most recent posting for Lower Decks is for the trailer release July 22nd, and these details aren’t in that one.)