Chip Zdarsky and Pasqual Ferry's Spider-Man What If mini-series, Spider's Shadow, was solicited as a four-issue mini-series Even the intro page to the first issue said so.
Chip Zdarsky & Pasqual Ferry's Spider's Shadow Gets Added Issue
But Marvel Comics have now told retailers that Spider-Man: Spider's Shadow will be a five-issue mini-series and have altered solicitations[...]