Greenplum Database 4.3 rolled out earlier this month and there are some big changes.
- Append-Optimized Tables: UPDATE and DELETE operations are enabled on what were previously Append-Only tables.
- Master Mirroring Enhanced: The way Master/StandbyMaster replication is implemented has changed. This should deliver faster master failover and many more of the functions related to it can now be done online.
Docs added to the docs page here