First, I don't believe there is a "South America" offer. Someone mentioned earlier that the rumor started on a South American Disney planning site.
Second, all of this August 1 stuff is just mere speculation. The only folks who know work for Disney, and they are not going to talk. August 1 could turn out to be the date. It is afterall the day after the current promotion ends. However, that would just be guessing as well.
Third, I am very skeptical of anyone on this board having direct knowledge. If there were a leak it would be all over the internet, not just one person on this site. The source being a South American website, I am even more skeptical.
Finally, while it is interesting to discuss, and I am very excited to learn about the FD offer as well, stressing over the date everyone knows is coming doesn't seem to make sense to me. Disney will announce this when they are ready, and everyone interested will have plenty of time to book.
This isn't like folks who are stressing over Calif Grill ressies. Knowing exactly when AD's will open up could mean the difference between getting a ressie or not. Here, the rooms won't fill up in the first hour, so don't sweat it at this point.
For what it's worth, several TA's that I follow on Facebook have "mentioned" that they have confirmed exciting news for Thursday, August 1 and to stay tuned. Some have even said they plan to be on the phone at 7:00 tomorrow morning and expect it to be a long day working with Disney. Adding that to all of the rumors across the web from places like Chip & Co. I am pretty convinced it is happening tomorrow . Super excited. I have to change my dates and pull my DD out of school for 2 1/2 days, but it will be worth it for free dining! Good luck everyone!