Some 10 hours or so he posted this neat picture:
… showing off custom code running on an iPod Nano 4th generation. If you want to keep track of his/their work on recent iPods, follow @linux4nano on twitter. I do!
While this is not yet Rockbox on the device, this is a least proof it can be done and this could indeed be seen as the first tiny steps towards a full port! Good job Michael!