(Un)fortunately I have just signed a NDA (Non-Disclosure Agreement) with FTDI Chip in order to develop the Android version of their FT(2)232 chip.

This agreement was approved by FTDI so I cannot publish either the documentation I have just received, or the source code I develop based on that documentation.
I will go on writing about my experience developing the USB VCP driver for Android entirely on Java, and  may be as a result of the project an obfuscate binary will be published in order to communicate with the FT(2)232 family.
One more thing to mention: FTDI writes very clear and nice documentation.