Here it is :
- PDF version : http://static.garmin.com/pumac/fenix5S_OM_EN.pdf
- Web version : http://www8.garmin.com/manuals/webhelp/fenix5/EN-US/GUID-C8E25FD1-3499-4B5C-B45F-C4BF88283284-homepage.html
Had a quick look at the chapter on the new training analytics and found it to be a bit lacking in details and screenshots.