According to Variety, Nicholas Braun is in talks to join the cast of The Entertainment System Is Down.
Slated to start shooting next month, the movie takes place on a long-haul flight where the entertainment system fails and passengers are forced to face the horror of being bored. (bolding is mine)
If this shoot does start filming next month and the shoot is supposed to be 70 days as claimed, considering Keanu has concert commitments with Dogstar from the end of May through the end of June, I expect the shoot will start in the mid to end of June with Keanu filming his parts when he returns from the tour.