Soen has Graspop in their events on facebook: https://www.facebook.com/SoenMusic/events
I wonder why GMM has not given an update on the new headliner. The problem is, there is no hurry, the festival is sold out and they can go for a cheap replacement...
Is it not an option for GMM and Gojira to cancel their gig at Vorst Nationaal on july 5th and replace A7X?
This gig has been replaced from february and a lot of ticketholders are on holiday that day. Also, this show doesn't sell out, in contrast to the two Tilburg shows one week later... Maybe they remain silent, so that both gigs in Graspop and Vorst can find place?
Alcatraz Festival did something similar with the gig of Arch Enemy / Behemoth next fall: cancel it and give both bands a headlinerspot...