fluff.tcz from the 4.x repo needs to be recompiled against the new libpng but otherwise seems to work (that goofy symlink trick that I did with sylpheed works here, too)
I'd recommend waiting for the recompiled fluff for 5.x, but it looks like that's all it needs. Of course, since its a file management tool, extra caution is in order if you play with it in the mean time.