Doubt they'd develop new 18m tips. The "neo" winglets are all designed to replace the "flying nun" 15m wingtips on the LS-8, and evidently other 15m LS gliders including the '6? (But not the '10 which already has modified flying nun winglets)
The 18m tips on LS6c really were added to the 15m wings as an afterthought to the formerly successful LS6 racing wing to support a self-launcher version, which never was marketed.