Can someone explain to me what the MF q change did this last patch?

For one it has a slightly more reliable mechanic put in it so it will hit the CLOSEST thing behind your main target. Also if you kill a unit with it the second part of it deals 150% more damage to something behind it. It is a great poking tool in lane if you can land it, I have used it a lot and can chunk down a quarter or so of my enemy ADC's health with one Q if i kill a minion with it. I love it a lot. It is also slightly more responsive as an Auto Attack reset i noticed, then again that may just be me.