They kept it under wraps so Corning could officially announce Gorilla Glass 4 in November, but our Note 4's have had it all along! This phone just keeps getting better!
http://www.trustedreviews.com/news/galaxy-note-4-also-secretly-showcased-gorilla-glass-4
http://www.corninggorillaglass.com/en/products-with-gorilla/samsung
http://www.trustedreviews.com/news/galaxy-note-4-also-secretly-showcased-gorilla-glass-4
http://www.corninggorillaglass.com/en/products-with-gorilla/samsung