Based on the list below from the main trade board thread Chicago looks like the likeliest players for Fleury.
Speculation: - Teams still in need of a goalie?
DET: Greiss|Bernier
CHI: ________|Subban|Delia
BUF: Hutton|Ullmark
CAR: Mrazek|Reimer
EDM: Smith|Koskinen|Forsberg
Think he's either going to Detroit, Chicago, or Buffalo with an outside chance of Carolina or Edmonton.
My guess is Buffalo misses out on their plan A options and circles back to Fleury. Something like Fleury + Krebs + 2nd for Ullmark.