It could be anytime from September to November from what I keep hearing.Thanks Nick i think i saw it on DSNY newscast for Mickeys Birthday in November
Honestly, everything at WDW this year is opening so late in the year, that I definitely wouldn’t plan a trip around it. A Summer 2020 trip will get you Runaway Railway, Galaxy’s Edge,and Ratatouille (+ the Skyliner and new Epcot show).