Windows Phone 10 is on the way! Before the final version is out we are going to see set of previews. By downloading Windows Insider app for Windows Phone you can see preview version of Windows Phone for yourself!
Windows Insider "sets up your phone to receive prelease software from Microsoft". See pictures below. For the time being (end of January 2015) there are no preview versions available. Please come back in February. As soon as the first preview arrives I will download and install it immediately and publish some screenshots.