Are the LDAP connectors still on the release-plan for this summer?
May we have a sneak peak somewhere as to how to implement / map LDAP users & groups with Enonic users and roles/groups? This will help understanding how we should estimate such an integration 
With the recent Enonic XP 6.6.0 release, we now have Pluggable ID Providers (ID Provider Documentation).
An LDAP ID Provider will be developed this summer yes (no implementation to look at yet).
First LDAP connector will be shipped with 6.7. ETA early September.