So the schedules are now out for these two shows. And it isn’t good for IDF fans. Up until now, it was widely believed from the wording released by Disney that both shows would alternate through the day.
However, BatB will run daily from 11am until 7pm, with IDF taking over from 7:30pm until 9pm.
At least I have it on good authority that the screen replacement and re-mastering for IDF is fantastic, with great audio and no breaks in the screen.
When will this change take place? I was really hoping to see IDF on our trip in March.
I wonder if this is just during the opening period - maybe expecting wait times and therefore alternating shows would be a mess? Or will BatB draw more crowds and need to have back to back showings permanently. (BatB having more to offer to younger crowd so daytime showing, IDF being more an older crowd so night time?)
January 17th is the premiere
Thanks! Will plan accordingly!
From the article:
** Both shows open on January 17 2020. **
Disney site has been updated to match this info also - at least IDF site…
Impressions de France
Friday, January 17, 2020
7:30 PM to 9:00 PM
https://disneyworld.disney.go.com/attractions/epcot/impressions-de-france/
and it’s already been updated in Touring Plans 
just went in to adjust my plan!