Microsoft has posted up a partial list of what's new, improved and fixed in the new Windows 10 Mobile preview build 10512. The list includes quite a few improvements but there doesn't appear to be any major new features in this build.
Here's the list, as posted by Microsoft's Windows Insider head Gabriel Aul:
- General improvement in overall stability and performance.
- You can now set the Lock screen and background image from within the Photos app.
- We fixed an issue where apps installed on SD cards weren't working after a reboot.
- We have improved Latvian and Chinese inputs.
- We have made improvements to the Kid's Corner tile layout.
- We have improved reliability of Data Sense notifications.
- Modified Shape Writing algorithm to be less aggressive in suggesting contact names over common words.
- Resolved an issue where Camera would not launch when the phone was locked.
- We fixed an issue where notifications for incoming text messages weren't appearing.
- We fixed an issue where the touch screen wouldn't be responsive after ending a phone call on some devices.
- And we fixed an issue where folder tiles have obviously overlapping text.