According to Microsoft, Windows 10 is going to be the last major version of Windows. In other words, Microsoft is taking a page from Apple which released OS X (its tenth version) in 2001 and has just been releasing updates every year (10.1, 10.2, 10.3, etc.).
Microsoft's first big update is coming this fall. Internally it was dubbed Threshold 2, but when it goes live it will be update 1511, which stands for November 2015.
The update will have security updates and fixes for minor problems Microsoft hasn't fixed in Windows yet, just like a regular update. However, it's also going to add some new features.
The Microsoft Edge browser is supposedly going to get some upgrades that bring its extra features more in line with its competitors. That doesn't include extensions, however.
Cortana, Microsoft's digital personal assistant, is getting some tweaks, including the ability to send text messages to smartphones right from your desktop. There's an updated Media Creation Tool that will appear. You'll also get more control over the Windows 10 Start Menu and new versions of familiar icons.
If you're running Windows 10, your computer will update automatically once the update arrives. We'll bring you more specific on the changes then.