With the usual "dunno how new this is" caveat, flew on a 7M9 yesterday and every time the seatbelt light was turned on, besides the pre-recorded male voice "please fasten your seatbelt" (which in my mind I previously only associated with UA widebodies?) it was followed every time ~3 seconds later by a pre-recorded female voice repeating "please fasten your seatbelt" and then invariably the FA made his own announcement as well

(thought about posting this in this thread instead: Can We Please Lose the Damn Automated Seatbelt Message? but this one is slightly less old... mods feel free to relocate/merge/delete as you see fit )