This allows you to create groups of servers (multiple servers per group) and do load balancing across servers inside a group, failover between servers, failover

This allows you to create groups of servers (multiple servers per group) and do load balancing across servers inside a group, failover between servers, failover between groups (based on some threshold number of servers inside a group having failed), geo-steering so that visitors from different parts of the world hit different groups. Today's announcement is currently only weighted round-robin within a group, but additional algorithms will be supported.