It’s already pretty well known where the Epcot one will go: upstairs from the American Adventure. The others – no idea yet.
I’ve been to the Disneyland Club 33 once. There’s a 10-year waiting list to become a member, the fee to join is $50,000, and you pay about $15k in dues annually. If WDW’s fees are anything like that, I’m not going to be a member anytime soon.