The new consoles are coming, and GameStop's monthly newsletter for November has several helpful suggestions for launch day accessories that'll maximize your PlayStation 4 experience, like additional controllers, the new Eye Camera, and a relatively useless small plastic rectangle.
Pointed out to us by several readers and appearing in my own inbox (I'm a Rewards member! Wooooooo!), GameStop's gaffe is pretty understandable. They've been writing about Xbox Live memberships as required for ages, while up until now PlayStation Plus has been a bonus, rather than something players actively need to play online.
We'll chalk it up to impending launch excitement. Or maybe copy-pasting from the Xbox One suggestions further down the page. One of those.