Do you have any effective strategies for launching a v2 of a WP site?

If you follow SethMerrick’s advice, you can greatly reduce the switchover time by lowering the TTL on the appropriate DNS records to 5 mins or so several hours (depending on what the current TTL is) before you change the IP address.

By doing this you are telling remote DNS servers to only cache the address for 5 mins. Once you change the IP, you can increase the TTL to whatever it was before. To further minimize the effect, do the switchover during a low traffic period.

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