As of today (11gR2PS1), OUD proxy covers most DPS features, except RDBMS and Join virtualization functions which are available with OVD.
Unlike DPS, it comes with a public Plugin API that can help the transition in case a very specific feature is missing.
Thanks for the reply. Is there any document which kinds of maps the features between old and new ones? Specially, the connections handlers, pools etc.
DPS connection handler corresponds OUD network groups. See Understanding Oracle Unified Directory Concepts and Architecture - 11g Release 2 (11.1.2)
Load balancing is available here : http://docs.oracle.com/cd/E37116_01/admin.111210/e22648/proxy_functionality.htm#solLOAD-BAL_BLOCK
Connection pools correspond to properties of the LDAP server workflow elements documented here: http://docs.oracle.com/cd/E37116_01/admin.111210/e22648/proxy_config.htm#solCONFIGURING-AN-LDAP-PROXY
Thanks a lot!