The Letterboxd synopsis for "Under the Boardwalk" compares the upcoming musical to "Grease," though it's still unknown what the songs will sound like. IMDb suggests that it will be a "pop punk jukebox musical comedy." Again, this appears to be speculation.
The one thing we do know for certain, so far, is the film's plot. According to Paramount Animation, "This musical comedy follows the hermit crabs who live under the boardwalk at the Jersey Shore. When Armen (a land crab townie) falls in love with Ramona (a sea crab tourist) tensions between their friends and families rise. But when a storm casts the duo far from home, their love will lead them on an epic adventure which unites the divided community."
Based on this description, it seems like "Under the Boardwalk" will be more than a love story about someone from the wrong side of the shore. Beyond the singing crabs, it'll be about overcoming differences and learning how to accept those who lead different lifestyles.
The July 2022 release date is still a while away, but more details about "Under the Boardwalk" will likely be announced soon.