I just picked up a few in Target on clearance and I noticed a few subtle differences in the packaging. I got one Grey w/LED, one Red w/o LED, and one Blue w/o LED.
The differences I can see so far:
Says "MP3 & JPEG COMPATIBLE! (Requires Mattel MP3 Starter Kit #H4448. Available soon.)"
Says "M-CHIP INCLUDED" on swoop/arc near chip
Label with snowboarder applied on top of flip cover, covering JUICE BOX(tm) logo
H4352-0980 in top left corner
Polygon symbol(??) above words "EXTERNAL SPEAKER" on far right
Refers to "M-CHIP" in blurb and diagram shows "MEDIA-CHIP SLOT"
(tm) near "TURN ON THE JUICE!" slogan
Says "MP3 & JPEG COMPATIBLE! (Requires Juice Box(tm) MP3 Starter Kit #H4448. Available soon.)"
Says "JUICEWARE(TM) CHIP INCLUDED" on swoop/arc near chip
Label with snowboarder applied under flip cover, JUICE BOX(tm) logo visible
H3906-0980G1 in top left corner
Refers to "JUICEWARE(tm) MEDIA-CHIP" in blurb and diagram shows "JUICEWARE(tm) SLOT"
Under product photo, "Colors and decorations may vary"
If anyone cares, maybe I can get some photos of the major differences and that weird little polygon symbol. I know for a fact that the Grey version has Production Test Ver. 2.6, I'll have to look at the others.