Secrets in comics mean absolutely nothing, especially if it means it'll generate more sales. DC announced the death of Superman in the 90s and reaped the sales from the speculation market. Publishers don't care. I knew a month before the public release of Batman #50 that Bruce Wayne and Selina Kyle weren't getting married because I didn't get a review copy as I normally do. DC only does that when they know the outcome will be leaked and affect their sales potential. Publishers don't care about spoilers if it affect the dollars.
Now, Marvel did have some concerns about this for safety reasons. This run by Zeb Wells and John Romita, Jr. is almost universally hated and they feared Wells was going to get Tom King-level hate as a result (after the release of Batman #50, DC had to hire personal security for King for his convention appearances. It was needed in a few instances). Marvel actually asked Wells to cancel his convention appearances post-ASM #26. I saw Wells at C2E2 in Chicago this year. He had very little traffic compared to others.