Readability (and Sony's book reader app) were both rejected as new apps, not as updates. It sounds like nit-picking, but there is precedent for Apple allowing

Readability (and Sony's book reader app) were both rejected as new apps, not as updates. It sounds like nit-picking, but there is precedent for Apple allowing grace periods to existing apps with undesirable behavior while rejecting new ones, indeed, I think they even mentioned this after announcing the in-app purchase changes.