In an interview with Marc Webb, he says that the next movies villain is hinted at throughout the "Amazing Spider-man". I think I picked out a few of the Hints which has lead me to one Villain that "Fits the boot" so to say.
Hint#1) The Car thief had a weird device(sorry couldn't find a picture)that he used to bypass the cars security. I don't know were he got it, and he does not seem smart enough to build it himself. So where did he get the car hacking device? even Captain Stacy said he was tracking the car thief to find the leader of the Thief Auto, so who could the leader be?
Hint#2) The cops had a strange sort of bullets that they were firing at spider-man. They seemed to be some sort of sticky-taser-darts. As far as I know these are not common issue in police forces, so where did they get them?
These first 2 hints beckoned the question,"Which Villain is smart enough to build such tech, and would supply it to both Criminals and Officers?". At that point I had a pretty good idea of who it could be. Then the credits scene only seemed to confirm my suspicion when i saw the final hint in this image of Micheal Massee.
His face and trench coat all but gave it away for me, I believe he is none other than
THE TINKERER
the tinkerer, a classic spider-man villain, was a scientist that was known for making deadly weaponry and then supplying it to the highest bidder, (most of them being other villains) while keeping himself armed with some of his best.
Here are the reasons why The Tinkerer "Fits the boot":
1) He could of easily built the tech and given it to the thief and cops just as part of his usual persona in the comics or as a bigger and grander plan.
2) As I said above the trench coat was the big revealer for me, the costume that Mike Massee is wearing is similar to resent and modern outfits the tinkerer has wore in "Spectacular Spider-man" and "Ultimate Alliance 2".
Not like the khakis and sweater he originally had.
3)As a scientist character it will be quite easy to introduce him as someone who worked with Curt Connors and Peters dad, and someone who works for Norman Osborn like Marc Webb said the villain was.
4)And finally the Villain I have heard most theorized is Mysterio because Micheal Massee goes to and from Connors cell with a lightning flash without being seen. Well in the comics Mysterio is actually the Tinkerers henchmen and gets his tech from the Tinkerer, Mysterio only added his own special effects knowledge to make it seem he was using magic and not tech. So having Massee's exit so recognizable as Mysterios powers only furthers the possibility of my claim. Tinkerer could have easily whipped up the tech to do that. Plus who knows maybe we might even seem Mysterio in a future film if Tinkerer is in the mix.
I personally think that the Tinkerer would be a badass villain to have in a movie. let me know in the comment what you think of my theory and if you agree or disagree.