Wikipedia has some interesting information about this ...
IPv6 - Wikipedia, the free encyclopedia
The article claims that the new system will allow for easier identification of the physical address of people due to a "more-strict hierarchical address assignment". This could be useful for targetting people in particular areas, but I think there are also some privacy concerns as it will lesson anonimity on the web.
The following quote is from
http://tech.hellyeah.com/display_doc.phtml?id=28
Quote:
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assume that there are 15 billion people on the planet. (currently, there are only 6.1 billion, and the largest estimates for the next fifty years project 12 billion). With 128 bits per IP address, each person could have 2.26e28 IP addresses to themselves. If we reduce it to 64 bits, each person would still have 1.2 billion addresses.
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