They did, they even said in the keynote that they're using a new aluminum alloy[1], and it's mentioned on the website as well[2] [1] http://www.theverge.com/20

They did, they even said in the keynote that they're using a new aluminum alloy[1], and it's mentioned on the website as well[2] [1] http://www.theverge.com/2015/9/12/9315471/iphone-6s-new-aluminum-doesnt-make-phone-heavier http://www.theverge.com/2015/9/12/9315471/iphone-6s-new-alum... [2] https://www.apple.com/iphone-6s/design/ https://www.apple.com/iphone-6s/design/