The differences between the two are resolution – the HD is 1280×800 with 300ppi while Plus is 480×800 with 216ppi. It’s also believed the Super AMOLED HD display will use pentile matrix instead of the RGB we’ve all come to know and love.
The shots we saw earlier of this supposed device suggest it’ll have hardware buttons, but to have a Super AMOLED HD display on this bad boy means we could be looking at a launch with Ice Cream Sandwich. That’s just speculation for the time being, though. For now, we’re just happy that Samsung has decided to stop stretching a WVGA resolution onto 4-inch-plus displays. [Thanks Eric! ETNews (Translated)]