The main conclusion is that both the documentation and the product software (SDK, libs, tools) are good. It's easy to get started on any operating system.
The API is a high level one enabling us to get results soon with our application.
I extract some interesting info from the product documentation:
The steps I took (Ubuntu 14.04) to get this working:
1. Download the SDK : https://developer.leapmotion.com/v2
2. Install the package.
In the downloaded folder type:
sudo dpkg --install Leap-*-x64.deb
All Leap Motion software is installed now; the control panel included. You can run it:
It's possible to check if the software (service or daemon) is working.