Thanks to +Denis Suarez for patching the test build that was posted on January 5th that +Griffin Millender did, you can now use that build on the N preview.
You will need the latest SuperSU for it to work, you do not need busybox for it.
If you want to use icons, you have to clear your launcher cache as before.
Working apk for N
https://drive.google.com/file/d/0B_gPy3iK1n4hdkxzRy1qTVFmTDg/view?usp=sharing
Obviously make sure you have the latest twrp since it is unknown which themes will work on N
Expect some force closes and some parts of themes not to work or crashes.
Edit: n6 use the link above.
5x, 6p Zip