Cyrano,
I don't know, but that's what I'm trying to find out. I'd read that ATC scenarios had been run and cleared. Perhaps it will be limited to turbo-props, but the local area, and that surrounding, is expanding it's domestic and industrial building like crazy. Could be, perhaps, yet a few years away before anything big happens. The site would certainly make for a good Dutch NEC rather than the RAI which is in the centre of AMS, and a similar beurs in Utrecht. They could combine both in Lelystad and then justify a descent airport.
Crystal ball gazing, perhaps.