I do think though, that people who really dont' want to be spoiled by things like the names of threads, would click on the main parts to get to the new posts instead of the 'show all posts since I last logged in' bit, that way you know exactly what you are getting in to.
I know it's easier to click that part, but still! I have always just gone into each section, theories, rumours etc, individually and seen what was new there like that. That way, you know what you are getting, and no one would accidentially click on things that will tell them stuff about what happend in OOTP, provided they stay out of the OOTP section up the top.
Well anyways, that's what I did before I got the book, and nothing was ruined for me.

Holly!