It seems that at Diamond Select Toys Minimates' Panel, some news might have accidentally spilled out about more Spider-Man: Homecoming villains. As pointed out by @GriffiLightning, rather off-the-cuffly, panelists seemed to confirm Shocker and Tinkerer for the movie. It's said that when talking about wanting to do a whole line of toys, they would include villains Vulture, Shocker and Tinkerer.
That certainly is interesting, and a weird group of bad guys. Of course, this could just be the toyline makers talking about a line of toys associated with the movie including the characters. Producing figures not in movies is not unheard of. I'll let you figure out where you land on this.