The latest expansions have been through either acquisition or joint ventures.
Recently Wyndham purchased Shell Vacations, now those properties are slowly becoming available.
Reminder there are many resort structures under Wyndham...
Club Wyndham
Wordmark
Margaritaville
Shell Vacation
Heck there has been some rumblings about Diamond Vacations (Just rumors from Tug Diamond Vacation forum)
Some of the resort become joint ventures like Portland is both Wyndham and Worldmark.
I suspect some Shell Vacation properties will be Shell / Wyndham.
However, some newer resorts like Worldmark Moab UT will be just Worldmart
With that said, most of the resort should be available from Club Pass
Reservations will require an additional fee and typically start 9 months out
As always, there are some exemptions to the rule