The August 5, 2005 Dynamic Forces Weekly Emailer spoils the Superman/Wonder Woman crossover. No two ways about it--if you don't want to know the big reveal, don't read that.
I've been making a strong effort to quarantine myself from spoilers--I'd like to try to make it through Infinite Crisis without knowing anything before the trade, if possible. That's one of the reasons for this blog--a place that those waiting for the trade can come to read news and reviews without worrying about learning "the news of the day."
I've subsequently cancelled my subscription to the Dynamic Forces Weekly Emailer.