From Canadian Power Wiki
The Airbus A320neo family is a re-engine development of its A320 family of narrow-body airliners, launched on December 1st 2010 by Airbus, where "neo" means "new engine option", with a choice of CFM International LEAP-1A or Pratt & Whitney PW1000G engines. The original family is now called A320ceo, for "current engine option".
The first flight of the A320neo took place on September 25th, 2014. It was introduced by Lufthansa on January 25th, 2016. Airbus has 5,063 firm orders as of February 2017.