I'm not going to link to the article because I don't want to tempt anyone with spoilers, so I'll just summarize the now-no-longer-a-spoiler-because-it's-not-going-to-happen-after-all.

Negotiations fell through between 20th Century Fox and a particular actor who was to have a role on Buffy this season. I'm very sad about this, as I was looking forward to it. I'm not going to reveal who The Actor is in the hope that things will work out, but if not, I'll mention it again at the end of the season.

The now-no-longer-a-spoiler-because-it's-not-going-to-happen-after-all was one of the last two spoilers of which I had knowledge (trying hard to stay spoiler-free!), but the article I mentioned above contained another minor spoiler, so I'm still at two. Anyone who doesn't mind spoilers and wants to read the article can email me.