As thought before Microsoft has now official announced a Chromecast competitor. The Microsoft Wireless Display Adapter. With this small device you can connect your Miracast supported device with your TV, you can almost turn any display into a second screen for your laptop, tablet or smartphone. Some Windows (Phone) devices as well as Android devices support Miracast, as well as the Microsoft Surface Pro 3.
The Wireless Display Adapter will cost arount $60 when it becomes available next month.