It's not out yet, but I was randomly looking at the
as-of-now current version (this is a stable link to that revision BTW) of the fixes37.0 file, specifically the General New Features. Lots of interesting little things there; some are quite whimsical, funny, or just plain silly:
tiny chance for randomly created spellbooks to be Discworld novels instead
wearing a wet towel confers "half damage from poison gas" attribute
more grades of self-appearance than beautiful or handsome vs ugly
tipping your cap might get a response
give feedback for '#chat' directed at walls
mild zombie apocalypse
let tourists read conical hats
It's often quipped that when it comes to Nethack, “the DevTeam thinks of everything” - and although I never was any good at this game, I think it's really neat that they do indeed continue to do so!