Here are the drop rates for all the items that drop in the new hunting ground added with the latest update.
-You need 470 gearscore to enter the hunting ground.
-You can only enter 1F solo, but 2F can be done in a party. If done in a party, all loot is split among members.
-You must pay 500,000 silver to enter the Hunting Ground from Klaipeda, Orsha, or Fedimian. You will have a buff for 1 hour that lets you fight monsters, and you can extend the buff inside or outside the hunting ground. Entering from a city requires the guild that owns the city from GTW to give permission, otherwise it must be entered from Kirtimas Forest (and costs 1 million silver instead).
(map image credit goes to M9)