While this is not confirmed, Techdare suspects that the OS 3.1 will be delayed because of a big Apple event on September 9th and reports from some developers that the OS needs more beta testing before release. 

What does this mean for augmented reality hype?  Not much really.  As we’ve seen some applications have already been snuck into the app store already.  I reported the Yelp app just last week (and I’m still wishing I had the newest iPhone to try it out) which garnered most of the recent interest in the fledgling technology.  All those AR apps waiting on the OS 3.1 will still be there, and will still get their moment in the spotlight when they’re released.