Here are some links to help you navigate the new bat standard:

Little League's new bat info page with video: http://www.littleleague.org/learn/equipment/baseballbatinfo.htm

Little League new bat standard FAQ page: http://www.littleleague.org/learn/equipment/baseballbatinfo/USA-Baseball-Bat-Standard-FAQs.htm

List of approved bats: https://usabat.com

Little League Bat Rules: https://www.littleleague.org/playing-rules/bat-rules/

(Look for this USA Baseball logo on the bat barrel, 1-2 inches above the tape)