Update: Now officially added.
According to reddit user MidnightAlchemist the American Express personal platinum card will be adding new benefits in October. The benefits are rumored to be:
- SIXT (car rental)
Looks like SIXT might be status based and the others are some form of statement credit. SoulCycle is owned by Equinox and American Express did have a partnership with SoulCycle in the past as well. For a premium travel card the American Express Platinum card is starting to resemble a coupon book.