replication - more than 2 servers?

We tested dovecot for a fair amount of time and decided finally to put it into production under CentOS 7 (we are running 2.2.10). I just joined the list, so I apologize for what is probably a question that has been answered many times, but I was wondering if there are any plans to implement replication among 3 or more servers (all "masters", as with 2)? As best as I can tell, replication seems to be limited to 2 servers, and it is not obvious to me even how more than 2 would be supported syntactically in the configs. That is, what might be an example of the "mail_replica" clauses if such a thing was supported?