Jazz/Sonic hoaxes are not entirely new:
http://www.netraptor.org/multimedia/hoax/hoaxnr.html
http://www.netraptor.org/multimedia/hoax/hoaxnr2.html
http://sonicveg.digibase.ca/creative...p?hoaxer=jafar
http://sonicveg.digibase.ca/creative...tart=11&end=20
http://www.sonichq.org/fanfair/pics/...ean/img278.gif
http://www.sonichq.org/fanfair/pics/...ean/img287.gif
http://www.sonichq.org/fanfair/pics/...ean/img288.gif
http://www.sonichq.org/fanfair/pics/...ean/img289.gif

Don't feel like looking for more right now.
Thunder: Yes. But they don't seem to get released very often, most of the stuff I see is just edited palettes.