Folder playback

No.

Not yet.

And it won’t be tomorrow.

They still have to get basic things to work, like further disassembling the firmware, getting acces to the flash data storage, writing LCD drivers etc. pp. I have no idea how long it will take them to get Rockboy to run on Fuze, Clip and co., maybe some months, maybe longer.
If you are interested in details:
Here is the status (Sansa V2 Family): http://www.rockbox.org/twiki/bin/view/Main/TargetStatus#New\_Platforms\_Currently\_Under\_De
Here is the working thread: SanDisk Sansa c200v2, m200v4, clipv1, clipv2, clip+, and fuzev2

Melchior.