As with all builds, this one fixes some bugs and breaks a few things (most notably Hyper-V seems to be broken in 10049.)
The big news with this build is the new browser, codenamed “Spartan”. Here is a brief list of features:
- It's designed to be a slim, fast browser, without all the legacy baggage
- Updates to Spartan will come from the Microsoft Store and are likely to be more frequent
- No legacy support, though Internet Explorer will still be around for businesses that need it
- New streamlined EdgeHTML engine for better performance
- Reader mode (suppressed junk, pop-ups, etc.)
- Cortana, Microsoft’s answer to SIRI, will be built in to the browser
- Web page annotation which will include “inking." The annotated page will be sharable (maybe with social media)
Windows 10 is still quite a ways from being able to use it for real, but I expect the next couple of builds to fix a lot of the little bugs that are normal this early in the release process.
For more details on Spartan, see Windows Blog.