Architectural questions (1)

Reverse lookup
With IPv6, reverse lookup failures will be more popular

How to utilize scoped address architecture
When is it useful?  How?  Any management twists?

Multicast
IPv4 multicast deployment is rather poor due to NAT, can we deploy multicast with IPv6?  Applications?

Prefix assignment
With IPv4 + DSL, /32 host will get connected dynamically
With IPv6 + DSL, /48 network will get connected dynamically - How to delegate/mananage/automate?  Architecture?

Anycast
What is real advantage of anycast?  Deployment issues?  Architectural impacts?  Actual applications?