I think the post-credit scene is a big clue to who might be the next villain.
The way I see it, I think the man in the shadows could definitely turn out to me Mysterio. His unique skill set could have easily let him vanish in and out of the cell undetected. Either that or it was Kurt talking to his "inner voice".
At the very least, we can be damn sure that it'll be
someone from the Sinister Six.
What do you guys think?
Ahh! So someone else thinks it could be Mysterio. I was watching the end scene and thought to myself, "Well that was very cryptic and mysterious..." BOOM "Oh wait a second...."
It does sorta fit his personality.
I also thought it might be his inner voice. Only reason I think its not is those scenes are there to give hints to the next movie. If its just him talking to himself it doesn't hint at anything for the second movie.
Third thought was maybe norman osborn. He does have enough power to get into his cell to talk to him. And he would know about Peter's parents. So that fits. I doubt it a bit though because they have already done Norman in the last set of spidys. So it would be almost like copying.
I'm leaning for Mysterio personally.