Developed by invinsible_asp and he claims it is 95% accurate to the actual Official KitKat Launcher. It actually is a modified S3 Launcher but not the one Sam-Ron modified. It is the exact launcher he extracted of a chinese device that he modified to look like KitKat.
App Update v1.0
1] The App Drawer is now full screen as it is in KITKAT [4.4].
2] Wallpapers have been optimized to small screens.
3] Enabled smooth scrolling and less Ram usage.
4] Anti-aliasing now enabled.
New "Kitkat" Style icons and Few Original Icons.
App Update v1.5
1] Added Unread counts feature.
2] improved start up and scrolling.
3] Removed unused setting options.
4] Fixed broken wallpaper issue.
App Update v2 Change-log.1] Added Kitkat Themed Unread counts .2] New and improved icons.
3] JellyBean Styled Settings Menu.
4] Added Sort Apps,Hide Apps and Uninstall Apps Feature
5] Few Behind the scenes improvement. 6] New Kitkat Styled Folders.
7] New Page indicators.
App Update v3 Change-log.1] Added Nexus 5 wallpaper as default .
2] App renamed to Google Home .
3] Fixed Icon issue .
App Update v4 Change-log.1] Added New Nexus 5 wallpaper .
2] New JB icons for now.
3] Fade in and out menu transition .
4] Kitkat transition added.
5] Removed Touch-wiz like features completely.
6] App size reduced by 200 KB [Not that much but still.
7] Fixed some Indian languages and some not.
8] Fixed some internal app issue and bugs [only few] .
9] Added "Backup and Restore" Home Screen feature to it.
10] New Screen Shots available 11] Version 5 [PROBABLY THE FINAL VERSION IS IN PROGRESS!!!! ]
Currently the app is on v4 as of this post but the final version which is v5 will be added shortly Google_home_v4.0.apk
For the latest version and/or updates, the official thread
[App] [2.3 +] Android 4.4 Kitkat Launcher for [GB] [ICS] [JB ...