Pryde have redone their alu Foil and it looks like... a slingshot? New head plates with board support, too.
http://bensens.dk/BLOG/news-neilpryde-wind-glide-foil/ (click English flag upper right for translation)
F4 is cooking up new stuff, too. http://f4fins.com/product/suspendisse-vitaesem/ longer fuselages (more stable) and 90cm wings.
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I have read that NP's original aluminum foil was aggravatingly noisy, May have been the motivation for a revision.
Alan
It had to do with the trailing edge. Sanding it at an angle solves the problem. I remember that Laser daggerboards had this problem back when I did that. They would sing when you planed.
New NP foil review and interesting insights. Also, apparently the Glide comes standard with a powerbox head. Unlike the previous NP alum heads which were welded on, the new ones are bolted on and both powerbox and deep tuttle available: https://translate.google.com/translate?hl=en&sl=fr&u=https://www.windsurf.boutique/actus/windfoil-test-neilpryde-rsflight-et-glide.html&prev=search
NP Foils now compatible with power box. Except for JP (NP group of products) boards.
http://jp-australia.com/2019/blog/no-foil-for-powerbox/
http://bensens.dk/BLOG/jppowerbox-foil-no-go/