As another poster said, not much traffic on this one - still don't know why Altea and New Toledo sections aren't combined
Anyway to answer your question, the bluetooth (BT) comms module is separate to the HU and can be upgraded - I had mine done about 10 months ago - from memory it was on version 5 and there was a version 6 available, although I had to convince my dealer that they didn't have the latest version, which they did eventually get and install.
Hope that helps.
John.