DK2 will continue to be supported as a development platform in 2016. That means you should upgrade to SDK 1.3 and access Oculus Home, Oculus Store, and Oculus app for Windows for development purposes.
DK2 is not officially supported as a consumer product, although it will provide access to aforementioned software. You can purchase software through the Oculus Store but it may not work as intended or at all.
Since DK2 is a developer kit and content on the Oculus Store is designed specifically for consumer Rift, there may be issues running it now or in the future. However, any purchase that you make using a DK2 is associated with your Oculus account, not a specific headset. That means your content will be available to you if you get a consumer Rift.
I’m developing an app with my DK2, how do I upgrade to PC SDK 1.3?
To upgrade to PC SDK 1.3, uninstall the old runtime, and download the new software from developer.oculus.com.
Can I test my app in the Oculus Store with my DK2?
Yes, you can utilize the release channel to preview and test your app before it goes into production.
Can I purchase content using my DK2?
Yes, you can purchase software through the Oculus Store but it may not work as intended or at all. All purchases that you make using DK2 with your Oculus account will also be available to you when you get a Rift—your account is the same.