The Apple Watch Series 12 is now available for pre-order, and unlike last year's model, it brings a substantial list of changes over its predecessor. Here's everything that's new. Last year, the Series 11 introduced just four changes over the Series 10, making it perhaps the smallest generational upgrade in the device's history. The Series 12 is a far more meaningful refresh, even though it essentially retains the same design for a third consecutive year.