As I have understood, the developper are at this moment trying to modify the original firmware to be able to launch rockbox. It's the first step of the port and perhaps the hardest (and it will perhaps not succeed). If it works the other steps should be easier but not shorter.
So the port should not be for tommorrow...
I bought a sansa fuze thinking it will be quick and easy to port rockbox to it because of the support for the previous version (sansa 200) and I am quitely disapointed too...
But I can now wait since sansa fuze firmware update bring the ogg and flac codec support!