Three things on this:
1. The Cure never said there would be an announcement today. That came from the South America media & the promoters. And as a friend said last time we went through this, never trust anything a SA promoter says. :) So if nothing happens today, blame promoter hype, not the band.
2. There might have been a misunderstanding in the media on just what was to be announced today. The Biggest Festival In The World did have a countdown clock to their big (and very underwhelming for a festival with that name) announcement, and did reveal part of their lineup today. However, their servers crashed, there was much confusion & disappointment, but so far, nothing about The Cure playing there or anywhere else in SA. But they HAVE added a 2nd day for the festival, with no bands listed as of yet.
3. Don't get all worked up or worried about this. If there's any official, confirmed news to be posted, it will be at the official site, official Facebook, or official Twitter. And I'll let you know within 5-10 minutes of that happening. Also, if nothing happens today, it doesn't mean they're not coming. No need to get upset. The world will not end. :)