We have another Windows 8.1 Update 1 leak on our hands! Build 9600.17025 is a much more recent build, being compiled on February 14. The build is expected to include only minor changes, being as Windows 8.1 Update 1 already hit RTM escrow with build 9600.16610.
This latest leak is an RTM Escrow build, meaning it's not complete and it's possible that it could contain bugs. We do not recommend you install any RTM Escrow builds on any production machines as this could lead to terrible problems with your system. It's not clear what's new in this build, however it's highly likely that changes in this build include bug fixes and no new features as RTM Escrow means the operating system is feature complete.
Again, we do not recommend you install this leak onto any production machines. Windows 8.1 Update 1 is set to launch sometime in April, and will be talked about at Microsoft's BUILD developer conference. Update 1 is set to include improvements for mouse and keyboard users, making the OS a lot more simple and easy to use.