After an agonizing two hours of downloading, installing, updating and upgrading and lots more waiting, we finally got the Windows 10 Insider Preview to run on our Lumia 630. Here’s a video showing how to install the upgrade on your phone:
A full detailed changelog is being uploaded now, not much longer for that video
P.S.: currently you need either a Lumia 630, 635, 638, 730 or 830 to install this build.