looking to try out the new Android KitKat launcher, but not looking to wait for the launch, you can install the launcher of the all new Android version with just a few installs. Just visit XDA-Developers and follow the instructions and download the files and install.
The new launcher is fully integrated with Google now and it just starts by saying "ok Google" and can also be accessed by swiping to the extreme left of the launcher. The app drawn now takes the full screen and also the widget selector is at different place, which I feel is a good improvement. You can try out the new launcher but I am not to sure how well it will work as it din't work out well for me.