We have heard that Build 10134 of Windows 10 Mobile is much improved, but currently has an upgrade bug preventing its public release to Insiders.
Now a report from WindowsCenter.ir claims that this bug has been fixed, and that we may see a new Technical Preview as soon as today or tomorrow.
The build is said to be much faster and more stable, feature transparent live tiles for a number of internal apps. Also the music and video bug has been fixed, and the build features a setting to increase text size. The Edge browser now also handles background downloads better. There is now also landscape mode updates to a number of apps, split screen view in settings and backgrounds on the task switching screen.
We have seen many of these improvements leak already, but not in a public build yet. Lets hope the next build is good enough for enthusiasts to use safely on their regular handsets, rather than the current build, which is clearly only suitable for test devices.