Board Thread:Questions and Answers/@comment-11084328-20151223192904/@comment-4651179-20151223202510

I think it's most likely that cover was one random unusued Spider-Man piece that Bryan Hitch made and they simply finally decided to use it.

And don't worry about editing, you can do it with no problem. Just be sure to use the "Preview" feature before you publish if you're afraid you might have broken the page. We've had visual editor for some months now, I don't use it, but I guess it's a tool that makes editing easier.