http://na.leagueoflegends.com/en/page/champion-update/miss-fortune-struts-pbe
They are nerfing "Make It Rain" by reducing its duration without increasing its damage, it does get more slow for early ranks tho it doesnt seem it gets any more in later ranks.
"Double Up" doesnt get much other than cleaned up coding apparently and a visual confirmation of a failed double bounce.
"Impure Shots" is getting grievous wounds removed, however it instantly procs the passive "Strut" when activated (if Strut stays in play while Impure shots is active kinda like Teemo speed buff this might be ok, if Strut still gets removed this is won't be as worth to warrant removing grievous wounds)
"Bullet Time" from what I can tell, untouched --_-- Bullet time is one of the most underwhelming ults in final rank/late game. Especially since she has to be stationary and she can easily accidently cancel her own ult, why can't this get a damage buff or make it scale with ad (which it should) Feels like they punish Mf for going ad in this ult.
Passive "Strut" might just be the silver lining. apparently IS getting tweaked for the better, Strut scales with level (I'm hoping that means we get more than +70 at lvl 18, otherwise consider that part nerfed) It also only gets removed from DIRECT non-damage over time attacks. Finally a little bit of love for her passive. If this also means minions wont take off her passive that will be amazing.
Overall: Riot seemed to tweak everything around making her passive a bit better. While that is nice, The rest of her kit either getting gimped or neglected I don't see making Miss Fortune any stronger practically. If anything she got weaker....again T.T The result in performance will either come out equal or less.
In my eyes she didn't receive enough to warrant her being more viable in higher elo's