Koster's new Severne Blade Pro, at Pozo on Monday.
Photo credit John Carter/ PWA
I think Jaeger Stone has one of the S1s in similar material but he's been on very small sail sizes so far, so has only been seen on standard S1s.
A recent windsurfing.tv video (Pozo training diaries) did show one of Jaeger's larger S1s in this new material, with welded/stichless seams.
I understand that Severne are launching some of the new products this week, at a Pozo evening event.
Those products should include the new sails, plus the new Nano II wave board. You can see pictures of that new board on the PWA site, amongst the Pozo action shots, because Baptiste Cloarec and Mauritz Mauch are both on one.