Google announced Android 4.4 KitKat yesterday. You can read about the changes and improvements included in the new Android version here. Today they released a new version of the Android SDK and both ADB and Fastboot were updated.
The ADB and Fastboot executables show the same version as before (1.0.31) but their MD5 checksums are different. This means they were modified in some way even if the version was kept the same. So, I decided to make a new installer based on the new files.