It seems to have gone from a 17 inch rear to a 16 inch rear in 2003. I suspect they did it so the 150 -16 rear is common on all (or a bunch...dodn't check all the specs) 2003 softails.
My local HD contact told me today that its a misprint on the web site. The other softails (Fatboy, Heritage) will now have a 150, but the Deuce will still have a 160.
the first day the 2003 bikes were up, they also showed the fat boy as having a spoked front wheel (the specs, not the pictures) so that typo theory makes sense.