IPv6 is an improved form of the existing IPv4. Its capable of handling a larger number of connections. Literally all servers these days come with IPv6 connections. The algorithm of a working cloud requires the assigning of lots of ip's as well as accepting a variety of them, the magnitude may not be as high as a sum total but it aids in better managementy, hence ipv6. Wiki ipv6 for more conceptual information.
IPv6 offers the potential to build a much more powerful Internet, with vastly larger scale compared to the current situation. Addresses in IPv4 have only 32 bits, allowing for only about 4 billion addresses, compared to 128-bit IPv6, with some 340 trillion, trillion, trillion addresses.