So, I guess there are new kinds of scripts.
Played a game as Eve, right? And I'm a good Eve, so I know to check every bush in my jungle for pinks, check for pinks after I gank, and go into normally warded areas while invisible. So, this enemy team... they could see me while I was invisible. Watching the way they move, the things they pulled off... it was obvious.
Three times, I would be somewhere ganking. Enemy's jungle near top lane, or something. I'd be walking around invisible, checking for pinks (there were none)... and then the INSTANT I get near his bush, this Ekko would jump out and instantly kill me. No pink wards (I went and checked after), nothing. And I was invisible.
And then, the one that clinched it: My brother was playing Soraka. Ekko was chasing him, since he was alone, right? I came FROM MY BASE while invisible, and my brother was nearly dead. As soon as I started to get close (not even close to the detection range), Ekko turned around instantly, flashed over a wall, and ran away. I went back into the lane and checked for pinks, and there were none. In teamfights, they kept on moving as if to intercept me as I went for their carry, and always seemed to know exactly where I was.
So... yeah. Watch out for new methods of cheating, guys.