Hey. So you want to know about running a game in the Feywild? A few notes about that place. First in the Feywild, time works differently. It takes 3 and a half hours to get "There" but only 45 Minutes to get back. The Feywild is a Plane Teeming with LIFE. Things are Bigger and more Powerful there, particularly Beasts, Magical Beasts and Primal Power Source Beings. Undead just don't happen in the Feywild either, and those from Outside it will not enjoy entering or traveling in it. Do not be surprised if the Party Revenent or Vampire suddenly sprouts a "Life".
Well, that is just a bit of my observations from Playing and Running games. If you are looking for more Official Infos, the "Heroes of the Feywild" book and to a lesser extent Primal Power have some good stuff too.
GF