Yeah I was going to going to post this earlier but 'Valentine' was on the telly. Anyway, there seems to be a number of Whedonesque posters who said that they were going to Comic Con so here's a discussion thread.
And if you think you're going to mention spoilers, remember the invisible text.
To use it:
<Span class="invisible">the text you want made invisible
And we get (highlight with mouse):
text made invisible