Emmanuel,
Umberto said that after work on LSZH (maybe during, who knows), they will remake KORD, and then probably KJFK, and so in chronological order as they were made. Right now the thing that most stands in the way of that update (other than time and the other airports) is Microsoft Flight. We do not know what FSDT's relationship with Microsoft is regarding flight (or if they have one), but that is a concern.
I am hoping for a delay of new products after KLAX's and GSX's release and their full dedication to updating old sceneries.
Hope this helps,
Regards