You'd be surprised how many people don't actually have a 3.9 GPA so don't worry. It all depends on the major, the school, etc. When it comes down to it, a 3.9 GPA doesn't necessarily guarantee you admissions over someone with a lower GPA. It all depends on the applicant!
In regards to people getting offers for fall 2012, a lot of graduate programs will start reviewing your application once you've submitted all documents. Some schools will go ahead and get back to you while others will wait until they have received all applications before making decisions for fall.
Don't worry!