One interesting thing will be making sure we can replicate from physical standby in the future as you mentioned elsewhere in the thread but I think that should be possible as long as you define the catalogs on master (not really sure yet if there are any barriers or not).
Agreed, after having spent the morning working on the details.
About the pg_dump support. While I don't think we'll necessarily want to dump all the information related to logical replication (like subscriptions), I definitely think we should dump replication sets and their membership info for example.
Agreed
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Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services