He will be at glasto, I'll let you know if he ends up doing a set. Other names, that are on the lineup - Cormac (Greenpeace), Demi Riquísimo doing 2 sets (Glade Dome & Genosys), one is B2B with DJ Tennis who is a self-confessed italo disco lover
Iicon set is the chroma AV show, whereas we don't really know what the levels one will be. I think you'll have a better chance getting into the iicon one on Friday. More space than levels and much more on to spread people on a Friday.
Yeah no solid info but a well educated guess. He pulled out of the levels last year due to cancer treatment, cancer-free in December, came back to perform Coachella, and back touring this summer - 1st set publicised is starting a week after Glasto in London