LPIC-3 300: Mixed Environment
LPIC-3 303: Security
LPIC-3 304: Virtualization and High Availability
Antony has mentioned that LPIC-3 Security course is under development, however no one has ever said anything about the other 2 paths.
Currently, I am not aware of any decent courses/guides on these topics, and Linux Academy can really shine by offering these courses. Many people want to go for these certs and I am sure they will be quite popular.