I'm planning a multisite Direct Access 2012 deployment. I do not currently have IPv6 implemented on my network, do I have to implement IPv6 between sites that will have an entry point? If not, what are the advantages for Direct Access 2012 having IPv6 implemented between the sites? 

Hi,

IPv6 is not mandatory on internal network. DNS64/NAT64 components will handle transition between DirectAccess IPv6 based IPSEC tunnels and IPv4 LAN. There is no need to have IPv4 routing between DirectAccess gateways involved in a multisite deployment.

Hi Jeff - if you stick to a deployment using IP-HTTPS then as this is essentially Https it will route fine between sites without having to place in IPv6 Routers and Benoit (as always :-) ) is also correct in his response.