We'd had a few leaked screenshots of Windows 10 and a very rough beta trial before, but with yesterday's presentation, we have a much better sense of where Windows 10 is going. I'm going to suggest restricting this thread to Windows tablets and PCs; Windows 10 will also exist on phones but will behave fundamentally differently on devices smaller than 8" (candidly, it behaves very much like Windows Phone 8.1 with some incremental improvements in various aspects; unlike the jump from Win8 to Win10 on PCs, it feels like a +0.1 update, not a whole new OS). The desktop and continuum: Windows will now automatically detect the size of the screen and type of device and try to tailor the UI to that. On laptops and desktops, this means no Start Screen but instead a start menu that has a "modern" look but is functionally very much like the Win7 start menu, plus the optional ability to pin live tiles in it as well. On slates, it will still offer a start screen like Win8.x, but it'll have a left-hand column that has a lot of the start-menu-style options. On convertible tablets, "continuum" will allow it to automatically detect when the device changes form factor and adjust accordingly. On laptops and desktops: Spoiler Continuum: Spoiler http://arstechnica.com/gadgets/2015/01/gallery-spending-a-few-minutes-face-to-face-with-windows-10/ Expose...sorry, Task View Spoiler http://arstechnica.com/information-...ew-start-menu-puts-focus-back-on-the-desktop/ In addition to using the taskbar for multi-window management on the desktop, "Task View" brings the option to use an Expose-like arrangement of physical thumbnails of all open windows. Also, there's multiple virtual desktops. Cortana on all Windows devices Microsoft was the last of the big three tech-wise to emphasize digital voice assistants, but was the first to really emphasize them in the desktop/laptop context (yes, I know technically speaking Google Now can do voice through Chrome, but it's hardly something Google emphasizes; and I don't think OSX has Siri yet). Not much to say here because I'm not a voice guy, but I could see this useful for people like my Dad. New hardware paradigms Windows 8 really put a focus on convertible tablets more so than previous versions of Windows had. Windows 10 emphasizes two new form factors: the Surface Hub, a smart whiteboard for business environments, and augmented reality visors (HoloLens), which can be useful for everything from 3D modeling to playing Minecraft. We don't know a lot about either yet, but those are the hardware form factors that we hadn't seen before. However, I think it's safe to say that these new hardware paradigms are intended to supplement traditional form factors, not replace them. We saw plenty of ads with Windows 8 about how a convertible tablet can replace both your PC and your tablet, but I don't expect Microsoft to argue that a Surface Hub or a HoloLens is meant to replace traditional PCs. Just supplement them. Pricing For the first year of its availability, Win10 will be a free upgrade for Win7 and Win8 users. No details on pricing after that, but they at least alluded to the option of a subscription instead of an up-front purchase with repeated use of the phrase "Windows as a service" (kind of like you now have the option of subscribing to Office instead of paying an up-front sum, but you can still buy it up-front if you want). I certainly don't think they're doing away with the traditional up-front purchasing option by adding that option, though, and I assume most people will still just get a Windows license bundled with their new PC and never actually buy a stand-alone license either way.