There won't be an Amazing Spider-man 3...Marvel's deal with Sony to have Spidey in the MCU means we have another reboot and the ASM series are cancelled. siguiente time we'll see Spidey he'll be played por a new actor in Captain America: Civil War. And then he'll have his own solo feature that's part of the MCU.
We'll have new everything: new amor interest (the return of Mary Jane? Here's hoping!), new villains (def. NEW Osborns that's for sure), new actors...So I'm not sure if the plans for the Sinister Six movie will continue.