Just received in the post my new Tuff Luv case for the PRS-650.
Its the 'flip style' one in black leather and I like it a lot so far. They have got rid of the white contrast stitching (which never bothered me, but I know other people really disliked it) and the front is very plain now (just a small embossed 'Tuff Luv' near the bottom of the case). The only other differences I have noticed so far are the presence of three SD card holders as opposed to two and the addition of a little flip over leather strap at the top, secured with velcro, to ensure that the reader can't fall out. Not sure that's entirely necessary though as it seems to be a very snug fit.
Link to it on Amazon
I ordered this a couple of weeks ago and I'm pleasantly surprised to see it here already as it's still showing as not in stock for 4 days on the i-nique website.