The units within have been given new artwork and updated equipment more fitting to the current edition. The Saurus for instance do not have bows (hard to hit anything with BS0!) and the Wood Elves do not have shields, as would be most unfitting.
Anyway, enough dilly-dallying, here are the rules:
http://issuu.com/m4cr1ii3n/docs/warhammer_expansion_-_classic_regiments_of_renown
http://www.scribd.com/doc/104475823/Warhammer-Expansion-Classic-Regiments-of-Renown