On top of this now.
The Mid season tanks have been revealed and the leak said that Zac would have the power to slam his enemies into each other... well
" First, Zac throws out a blob hand that sticks onto the first enemy he hits. Once he latches onto something, his next basic attack becomes equally sticky, and he’ll use his noodly appendages to slam both targets into each other."
Sounds pretty much like the leak.
Then it also said Maokai would have a brand new ult, oh look at that
"The biggest change of Maokai’s update is to his ult, which has been completely redesigned. Nature’s Grasp summons a lane-wide wall of roots that slowly advances forward, each one rooting (heh) the first enemy champion hit. The wall has devastating teamfight potential, but its slow speed demands that Maokai plan around it. To find success, the Twisted Treant has to corral enemies into the wall’s path and keep them there until nature runs its course."
Only thing that was in the leak so far that's not here was it said something about Maokai having "Sticky Saplings" and yeah that sounded pretty dumb. Instead they've told us that they deal more damage when tossed into Brush and that sounds nice.
So looks like more and more of this stuff is actually happening and we can count on most of this leak to become something real. Yes, there's still a lot there and possibility of more not showing up but pretty confident the skins will at least prove to be pretty true.