FWIW, the 3802 has a 32 bit DSP engine, the 2802 is only 24. I believe that the 3802 has 24/96 DACs, and the 3803 will have 24/192s. The 3803 will have more power too, but as a pre/pro, that doesn't matter much. The 3803 will add 60 and 40 Hz crossovers (but still more than likely global).

There are threads on HTF that have more differences.