The Irish News posted their interview with Alex Winter for The Panama Papers. Towards the end of the interview he was asked about Bill and Ted’s Face the Music. He said the following:
I’m in heavy prep on that and have been for the better part of the year. I’ll be leaving to start filming in about a week-and-a-half, so it’s all go at the moment.
The shoot is scheduled to start on June 24. From Alex’s comment it sounds like folks will be arriving in New Orleans in the June 16-18 range.