I am sure they are exploring new spaces like VR, AR, cars, etc but they haven't finished a decent product yet so they don't announce it. They are the opposite of Google, where they announce every new project only to kill it later (Ara, Fiber, Glass, etc).
They don't really like to announce a product before it's ready. The root is their hardware background. They need to nail the product in the first iteration or it will fail. Move fast and break things don't apply to them.