This is what I just wrote on the above referenced thread about what I was told whhen I called to ask about this:
"I called yesterday and the guy first told me 60, then I told him I thought I heard it was now 90 and he said "Uh, yeah, well, we just had a change so technically it's 90." Like he wasn't supposed to tell people this unless they specifically asked. Anyway, he also said that you have to be paid in full before you can book, even with the 90 day policy. So it seems to me as if Disney has found a way to get you to pay even sooner than you might ordinarily pay. I'm not paid in full and am not paying until I absolutely have to, so I can't book."