According to the Wall Street Journal, Apple will require any subscription-based periodical apps on the App Store to offer an in-app purchase option by March 31 or else face rejection. While that may sound like a fairly draconian demand on Apple's part, the Journal also notes (albeit way down in the article) that Apple is still allowing publishers to offer subscription purchasing options outside the App Store so long as in-app purchasing is offered, too.
While the Journal says Apple hasn't commented on what this means for ebook apps like Amazon's Kindle reader, I'll go out on a limb and say that Sony's recent "the sky is falling" media frenzy following the
