Reading the above conversation makes me realize how far behind I am in understanding the SHS to MTH transation. I am not aware that MTH sells "memberships" nor have I purchased any MTH S product since SHS sold the business. If the first two "annual" cars have been Eastern railroads LI and C&O, then I'm not particularly interested.
MTH began the "Club" in 1999 and has been offering club cars since, beginning in 3-rail O and later expanding it into the other product lines.
Don't worry about being behind about the transition. It's been going poorly (to be polite about it.) You haven't missed anything.
Since there's only been one S catalog in 2013, the only way one would know about club cars are either here or if one picked up one of the other MTH catalogs. MTH S gets very little buzz on the other discussion boards from what I can determine.
The first S club car was sorta "western," a gold DM&IR ore car in 2014:
It's prototype paint job has been unverifiable, but it actually looks better in real life and is none-the-less an oddly attractive car.