Straight from Microsoft Build 2015.
Here are some of the key takeaways:
Goodbye, Internet Explorer. Windows 10 comes with a new built-in browser called Microsoft Edge. Microsoft Edge, which staffers have referred to as “Project Spartan” until today, has built-in Cortana (the company's personal assistant that's similar to Siri), built-in note-taking and sharing features, and a more personalized “new tab” tab.