As has been rumored and speculated for a while now, AviationWeek is reporting the carrier may be poised to place an order for the NEO:
"Indonesia’s Lion Air, the world’s largest customer for Boeing 737-900ERs, may be about to place an order for Airbus aircraft.
Sources close to the airline tell Aviation Week that President Director Rusdi Kirana is considering Airbus's new engine option for its A320 family of narrowbodies. It is unclear, however, which NEO variant he would order, or how many. Lion Air officials were unavailable for comment.
If Rusdi decides to purchase Airbus narrowbodies, it will be a major coup for the European manufacturer, although vindication for a sales campaign to win over Lion, one of Boeing’s largest customers. According to Boeing's website, Lion's backlog consists of 201 Boeing 737 MAX aircraft, 123 737-900ERs, nine 737-800s and five 787-8s."