Marvel did a press release announcing a prelude to the Sins Rising arc of Amazing Spider-Man.

AMAZING SPIDER-MAN: SINS RISING PRELUDE #1
NICK SPENCER (W) • KIM JACINTO (A)
Cover by RYAN OTTLEY
- Who is the Sin-Eater, and why is it so terrifying that he’s back?
- Nick Spencer pulls back the curtain on one of the most dangerous Spidey villains in history.
- We will not only reveal more of Sin-Eater’s secret history but put him on a collision course with Spider-Man that will have you quaking in your seat.
It's curious that that this is a one-shot, rather than an issue of Amazing Spider-Man.

I guess they have the issues leading to Amazing Spider-Man #50 (or maybe #850) very locked in.