I think that snippet is real. It sounds like it has a Billy Jean sample and I'm sure Britney is aware that Britney Jean sounds like Billy Jean and thought it would be cute to throw that in there. Also, when I googled the lyrics nothing came up.
I actually like the title but I kinda wish it was "Britney Jean Spears". Her full name would've worked much better. Work Bitch is such a bop, I still use it so much. I'm seriously looking forward for this album to be honest.
Maybe not written herself but "Piece of Me", "Why Should I Be Sad" are good examples. I know what you mean though. This'll hopefully be in vein of In the Zone where she's really talkin about stuff.