A new update KB3025380 is rolling out now for Windows 10 tech preview devices. This WU update prepares system for next Windows 10 Build from FBL_Awesome branch. It seems that now onwards, new Builds will come from this branch including the one that will be released on January 21, the day of the Microsoft event.
@JoelElvine KB3025380 preps your system for builds from fbl_awesome branch. Are you hitting crashes in Explorer or the GDI leak?
— Gabriel Aul (@GabeAul) December 18, 2014
— Gabriel Aul (@GabeAul) December 19, 2014
The leaked Build 9901 gives you an idea of what to expect from the future Windows 10 builds. The future Builds are expected to be more consumer-oriented with interface tweaks, advanced version of Cortana and more features in sync with Windows Phone.