Jack99
Adventurer
Hero's Handbook: Eladrin isn't a full fey campaign setting - many of its 96 pages are devoted to character-focused info like feats and paragon paths - but it'll sure serve as a great appetizer to your appetite for a Feywild campaign. There's lots of evocative detail about cities in the fey realm, the different seasonal ruling houses of the eladrin court, monsters and NPCs native to the realm, etc., etc.
I plug it without shame because, although I did some work on the book, my contributions were all mechanics; I didn't write any of the background info and so can call it freakin' awesome without fear of bias. I can say, though, that it was really fun to get descriptions of cool paragon paths and monsters and be challenged to come up with mechanics to support that flavor; kind of like sudoku for the 4E designer!
If it's at par with the dragonborn handbook, it will indeed be awesome!