How about official native Erlang client ?
It's very sad, that project in which Erlang code take big share has no native client for Erlang. It's only thing which prevent using your beautiful software in big distributed projects. When it's possible to get native (not third-party) client for Erlang ?
The "official clients" are based on the most popular languages used to build applications at the top of Couchbase Server. Today Erlang has not been used a lot to build application, this is why you do not see any official Erlang client in the roadmap.