I'd say Microsoft Studio was an innovative desktop platform, and so is the HP Envy Curve. There's interesting stuff happening in gaming desktops, too, including

I'd say Microsoft Studio was an innovative desktop platform, and so is the HP Envy Curve. There's interesting stuff happening in gaming desktops, too, including VR add-ons. If you include laptops as part of the "traditional desktop ecosystem" then there are lots of innovative 2-in-1s, detachables and convertibles, including the Lenovo Book (a laptop with no physical keyboard). The "traditional desktop ecosystem" in the form of Windows has also added a lot of features from the mobile ecosystem including sandboxed apps maintained from an app store, notifications, and a voice-controlled AI (Cortana). The mobile world has reached the stage where you have to look pretty closely to tell one high-end phone from any other high-end phone, and the tablet market is in steep decline. The PC market looks quite innovative in comparison.