Google has updated the Nexus developer page with links to factory images for the latest Nexus 9 Lollipop build. Don't get too excited, though. This is the 5.0.2 build that started going out as an OTA earlier today. Google, you monster.
You should know the drill by now—if your bootloader is unlocked, you can flash the factory image to restore your device to stock. It's also handy for updating a stock device if you've rooted it, since OTAs no longer work in that scenario. The new images are available for both the LTE and WiFi N9.
Feel free to download the new factory images and then weep over your Nexus 9. Google feels no sympathy, it feeds on your sorrow.
- Nexus factory images