At the opening keynote during Build 2015 this morning, Microsoft demonstrated several new Windows 10 features and even named Project Spartan. Shortly after, they released Build 10074 which includes those very features.

Besides increasing the build number this time, Microsoft says that from now on, preview builds will be called 'Insider Preview' opposed to the 'Technical Preview' name which the pre-released software has been bearing for months.

One other subtle change that you’ll notice is that we’ve changed how we talk about the builds from “Technical Preview” to “Insider Preview” to reflect the importance of the Windows Insider community in how we’re building Windows 10.

Also special for this release is Microsoft is simultaneously releasing this update for both fast and slow ring users which means everyone will be able to try out this update. I've been using the update for a couple of hours now and i have to say this is probably the most stable build yet.

Besides improving the UI and introducing visual features like the AeroGlass theme on to Windows 10, Microsoft has also improved on Cortana and she now has a more sleeker look to her dashboard. Here's a few phrases you can try asking her.

• Weather – “Seattle Weather”
• Finance – “MSFT stock”
• Dictionary – “define astounding”
• Calculator – “48*92”
• Flight Status – “UA 238”
• Reference – “how tall is brad pitt”
• Showtimes – “movies near me”
• Tech Help – “memory in my computer”
• Time Zone – “time in London”
• Unit Conversion – “42 ft in meters”
• Chit Chat – “tell me a joke”

 That's as far as it gets, and expect to see builds come faster as the weeks advance. You can install Build 10074 onto your system via the available ISO file at insider.windows.com or directly update from a previous Technical Preview build if you don't fancy a clean install.

Read more on what's new in Build 10074 in the official blog entry