My cynical side thinks that Joss wants to pique our interest in Fray so we'll all rush out and buy the paperback so we can work out what the hell is going on.

Yes, I thought about it too. Pretty possible that Fox and Dark Horse plan to milk the franchise as long as it's milkable. Recent talks about reviving Buffy: Animated series seem to point in this direction.

was totally gobsmacked at the revelation on the last page

Me too.

Spike:After the Fall. Delicious fun.

Hee!