Although we have only seen the Technical Preview and a single update to it so far, you can see the potential for Windows 10 and what it will be able to accomplish. It is an ambitious goal to provide a single platform across such a swath of different devices, and one that was held back by the user interface before. With Continuum, it appears that it may be the best of both worlds. Even more exciting is how much more upfront and open Microsoft has been on this entire process, with not just the technical preview but also soliciting and requesting user feedback on the changes. One of the biggest change requests was a simple animation on the Start Menu, and that has already been implemented, so this really is a different world than when Windows 8 was given a sneak peek.
From a technical point of view, Windows 8 was great. However, it was hampered by bad user interface and interaction design at virtually every level. If Windows 10 will undo at least some of the damage done, then it’s a great leap forward.