Redhat DB differences

When Bruce started the "Are we losing momentum" thread he said:

"... Specifically, they are concerned about Red Hat dropping their Red Hat Database and instead distributing PostgreSQL
aspart of Red Hat Enterprise Server ..."
 

Redhat Database is based on Postgres correct?

What are the differences between RHDB and Postgres?

Will Redhat be contributing any of those added features / capabilities / etc., back to the Postgres project if RHDB
continuesto be shipped?  What if RHDB is no longer shipped, will those features be contributed back to Postgres, or
justallowed to die?
 

Later
Rob