4. Aggregated search
Instead of having to select an app and then search when you go to the Search charm, Bing now powers an aggregated search system from the web, your files, SkyDrive and elsewhere. Leblond says: "We think this will really change the way you interact with the Web and with Windows making it quicker and easier to get things done. It is the modern version of the command line! Results from local files, apps, and settings are easily accessed in the same convenient view by scrolling to the left."
5. Enhanced apps
New app enhancements are also promised to all the built-in apps. According to Leblond: "The Photos app now has some new editing features that let you quickly edit or adjust photos when you view them in the Photos app or open them from other places like the Mail, SkyDrive, and Camera apps. And our Music app has been completely redesigned to help pick and play music from your collection. We plan to talk more about updates to the built in apps in Windows 8.1 and some brand new apps we will be introducing in [the] future. We're also making improvements for using multiple apps at once in Windows 8.1."
6. More snap views
If, like us, you use Windows 8 a lot, you'll have been frustrated by the lack of 50:50 split snap views. This is the game-changer for Windows 8 apps. "You will have more ways to see multiple apps on the screen at the same time," says Leblond. "You can resize apps to any size you want, share the screen between two apps, or have up to three apps on each screen if you have a multiple displays connected, you can have different Windows Store apps running on all the displays at the same time and the Start Screen can stay open on one monitor (yes!). This makes multi-tasking even easier. Also in Windows 8.1, you can have multiple windows of the same app snapped together - such as two Internet Explorer windows." We're really looking forward to that.
7. An enhanced Windows Store
App updates will now install automatically in the background as they come through the Store. And search is available in the upper right hand corner for finding the apps you want. Leblond elaborates: "The improved Windows Store is designed to show more info than before in Windows 8 with detailed lists of top free apps, new releases, and picks for you on the homepage. The app listing is more descriptive and informative and includes an area for related apps to help with app discovery."
8. Save direct to SkyDrive, plus offline files
In Windows 8.1 your files can be saved directly to SkyDrive. The SkyDrive app will also get a new update so that files are available even when offline - as in the desktop version.
9. You no longer need the desktop Control Panel
The updated PC Settings in Windows 8.1 gives you access to all your settings on your device without having to go to the Control Panel on the desktop. "You can do things like change your display resolution, set power options, see the make and model of my PC, change the product key, let me do Windows Update, and even join a domain – all from PC Settings," says Leblond. You can also manage SkyDrive from PC Settings as well.
10. A new Internet Explorer
Internet Explorer 11 will ship with Windows 8.1. "IE11 will offer even better touch performance, faster page load times and several other new features we think you will enjoy," says Leblond. "For example, you can now adjust the appearance of modern IE11 to always show the address bar and you can have as many open tabs as you like. And you can access your open tabs in sync across your other Windows 8.1 devices."
11. Better with a mouse and keyboard
For devices without touch, Windows 8.1 features a number of improvements for easier navigation using a mouse and keyboard. "PCs today are evolving for a world of mobile computing where people interact with their devices through touch, and we designed Windows 8 for this," explains Leblond. "But we also recognize there are many non-touch devices in use today - especially in the commercial setting."
12. A change to the Start 'tip'
You've already heard about this one, right? Leblond adds that there are also options to change what the corners do, and options to boot into alternate screens: "For example, if you prefer to see the Apps view versus all the tiles, you can choose to have the Start screen go directly to Apps view."
Microsoft says it will be releasing more Windows 8.1 details "in the coming weeks. As you've heard us talk about before, Windows 8.1 will be available later this year as a free update."
Microsoft also says that it will also be sharing more about Windows Embedded at Build. Embedded will be
"updated in the same timeframe as Windows 8.1. We're aligning the platforms even more to bring Windows to form factors of all types, including not only tablets and PCs, but also the growing category of devices such as ATMs, point of service (POS) terminals, and kiosks."
Are you a pro? Subscribe to our newsletter
Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed!
Dan (Twitter, Google+) is TechRadar's Former Deputy Editor and is now in charge at our sister site T3.com. Covering all things computing, internet and mobile he's a seasoned regular at major tech shows such as CES, IFA and Mobile World Congress. Dan has also been a tech expert for many outlets including BBC Radio 4, 5Live and the World Service, The Sun and ITV News.