We can see that Windows Store on the build is already out of its beta stage. The Store and Edge browser tiles are also changed to a transparent design. The wallet application is also updated. From what we know, the phone now supports 120FPS video recording.
According to T4ufik_Hidayat, the main difference of the OS is how smooth it runs. He was surprised at how well the OS runs, and that it was significantly faster than the previous 10149 build, especially on such a mainstream hardware.
Build 10158 will not be released to the public, and the next release should have a release number of 1016x. This will definitely be good news for both developers and end users, as we all know that the update will be out really soon.