It looks like it is gone. I hate it when features are just removed. This feature seemed to fly off the radar. It was like having a ChromeBook for free.
On the plus side, a feature removed from Lion came back called "console". Type in >console in the login box if you have your Mac use the login/password prompt enabled. It will bring your Mac directly to a UNIX prompt. This feature was removed in Lion and came back from the dead. I don't know if anyone on the planet except for me noticed this feature missing in Lion.
Wow...guess it was hidden in there anyway. Guess I didn't think to use that. I don't believe that I have ever used filevault2. Why would they only allow its use when using filevault2? Seems like it was a better feature if it was used with find my mac.