What's the harm? Jason has already put a spoiler-free review out there that some treat with skepticism, so why not allow other voices to chime in with their thoughts as well? If visitors choose not to read them, that's their prerogative, but I don't think everyone should be denied the chance to read them on that account; I have no interest in certain sections of this site, but I would hardly say they should be shut down solely because I'm not interested in using them. Speaking for myself, I am expecting an advance copy and don't have a blog of my own to review it on. If I can't post my review here (my first choice), I'll post it to another WoT site, so any ban on spoiler-free reviews here wouldn't prevent me from getting my review out there. I think a reasonable compromise might be to allow spoiler-free reviews but only to the extent that the reviewer sends the admins some kind of proof that they have the book (a scanned copy of the first page of Chapter 2, for example).

Just my two cents!