Yesterday we learned that Alex Kurtzman, Roberto Orci, and Jeff Pinkner are all set to come back to write The Amazing Spider-Man 3. It looks like someone else will return as well. Paul Giamatti revealed in an interview with Collider that he'll be reprising his role as the Rhino in the third film, but not the fourth. This is what he said,
"I think I'm only doing the next movie, I don't think I'm in the next-next movie."
The interviewer then brought up Sinister Six, and he replied,
"They've not told me anything hard and fast about that."
But we all know that's most likely going to be the plan anyway. We've seen too much evidence that it is the direction they are taking the franchise. The third movie is set to be released on June 10th, 2016, and the fourth on May 4th, 2018.