I can't give you a release date, but there is a beta of an agent underway right now. Does look like it will be a post-sp3 patch rather than waiting until the next version.
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MarXtar is correct. We are currently in beta with a Mountain Lion compatible agent for LDMS/LDSS 9.0 SP3. Currently, the progress on the Mountain Lion agent is going well and we do expect to have an agent to make available to our customers shortly after Apple's official release for Mountain Lion.