Everybody is talking about Nighttime Kingdom, a rumored 'Boutique Experience' as scooped by Jim Hill. The experience would be a VIP style immersive themed environment with a very low attendance cap (say 2,000 guests in total). Hill mentions a possible 'Adventurer's Club' theme even physically moving away the popular "Adventurer's Club" from Pleasure Island to become the launching point for this new experience.
http://www.thedisneyblog.com/tdb/2008/02/new-theme-park.html