Folder sync has been implemented in beta 10. You will need to go through the welcome screen and select "I'm an existing 1Password user" -> "My 1Password data is stored locally" and select your agilekeychain through the file manager.
If you have already set up a agilekeychain with 1Password and would like to switch to folder sync, you will need to reset all of 1Password's data & settings and start it up as if you are running it for the very first time. The beta does not support switching from a preexisting configuration at the moment. Here's what you will need to do if you have already set up 1Password:
This will remove all of your 1Password data on the device. Please make sure to safely store any new items that have not synced over, everything will be deleted permanently.
You can now launch 1Password Beta and continue through the welcome screen to set up folder sync.