Quite a few items in the archaeology skills that foreshadow future dungeon or raid drops. Generally anything that speaks of a set of items seems to indicate the one you recovered was drained of its magic but the other is "lost but may yet survive"
Some examples:
http://db.mmo-champion.com/s/91221/w...of-burningeye/
http://db.mmo-champion.com/s/91224/word-of-empress-zoe/
Also I love the description on this one: http://db.mmo-champion.com/s/90988/i...ure-chest-key/
Also possible new companion: http://db.mmo-champion.com/s/90521/clockwork-gnome/
And perhaps a new mount as well: http://db.mmo-champion.com/s/91089/p...rake-skeleton/
Sorry if this has been posted elsewhere, but I don't remember seeing reference to any of them.