All it is is the 2004 model-year version of the 2803 (the large OEMs change model lineups annually, just like the automotive manufacturers). It might sport some "improvements" (depending on the creativity of the copywriters working at Denon's ad agency) and some cosmetic changes. Who knows? Some of the "improvements" might even be genuine. If you can find a super price for the 2003's 2303 at an authorized (important) Denon reseller, go for it. JB
I would anticipate some "bigger" changes between the 2803 and 2804. Remember, Denon made a couple of "small" changes to the 4802 and released it as an AVR-4802R and not a 4803 or 4804.