I too was curious about this and contacted RIM. This is their reply:
Thank you for contacting BlackBerry Technical Support.
I was looking further into this module and I have found information on it. This particular module was part of an older software release and is no longer used in the newer versions. Your user's will not see any differences with their handheld.
There is no need to provide the information from the previous email request.
If you require further assistance, please don't hesitate to contact us. Thank you again for contacting us.
BlackBerry Technical Support
Research In Motion Limited