Not many, and that's a good thing. The floppy icon only didn't represent well the abstract act of saving files. As it turns out it's just plain better present to users a button with the clear text inside, save. Or completely remove it from the UI, and do auto save for users.
On a side note, Windows 8 is beta as were: windows vista, winxp pre sp3, win2k, win millennium, win98, win95, win 3.x, and previous. Microsoft had only two versions of Windows that were really usable, stable, and fast: WinNT 4, and Win7.
I get frustrated when things move from text to icons. E.g. gmail (at least on android). Studies have shown that text buttons like "mark as spam" are more usable; I wish google would listen.
On a side note, Windows 8 is beta as were: windows vista, winxp pre sp3, win2k, win millennium, win98, win95, win 3.x, and previous. Microsoft had only two versions of Windows that were really usable, stable, and fast: WinNT 4, and Win7.