December 30th for its 12-and-under divisions of play. Williamsport released an article today on its website with clarification on various aspects of the decision.
Little League points out that it has not created new bat standards, but is rather enforcing its existing safety guidelines (1.15 BPF). Through scientific testing, it was discovered that composite-barreled bats, once broken in, were exceeding those standards.
More helpful to coaches and parents, Little League included in today's information a short FAQ section at the bottom of its article, a link to its Facebook discussion on the subject, and most importantly, a detailed list of specific non-wood bats that are currently approved for play in 2011. I received my own new bat today and was relieved to see it on the list.
I will continue to post more information as I get it. At some point, they will publish a list of any composite bats receiving a waiver, if any. Click on the "Bats" label below for more info.