New Windows 10 Mobile insider preview build 14342.1004 is now available. Today’s build is intended to fix battery issues and also includes a fix for an issue which causing some devices to get hot. So there are no new features in this build.  There were numerous reports of failed installation or setup stuck at logo screen with last few builds, which Microsoft fixed with build 14342.1003. Microsoft is fixing those bugs one by one.

Gabriel Aul informed Insiders about new build:

Build 14342.1004 Change log:

We are releasing Build 14342.1004 today for Windows Insiders in the Fast ring. This build is exactly the same but with some additional fixes including a fix for the battery life issues we were seeing on some devices such as the Lumia 930, 929 and others which was also causing these devices to get hot.