As far as I can tell, it cannot.
I just finished upgrading all my controllers (620 locals and 3600 masters) to 6.3.1.9.
I have a couple of 7005 that I'd like to start testing and deploying. They ship with 6.4.1.0.
I was able to successfully demote a 7005 as a local controller, however it doesn't appear to pull any information from the master controller.
Upgraded the 7005 to 6.4.2.0 and having the same issue.
6.4.x is still listed as early development - we have a policy of not deploying ED firmware.
Looks like my choices at this time are to just deploy the 7005 as a master, and copy the config from my existing master and hope for the best???
#3600#7005