The #OpenLDAP 2.7 release branch is now available for testing. It now uses #LMDB 1.0. Both of these are still just release candidates, and not tagged as official release versions yet.
https://lists.openldap.org/hyperkitty/list/openldap-technical@openldap.org/thread/GIW5ZD5WJHYJF6FAS623EPQMWZUTQK6A/