Original: Currently available in the arcades, the PSP and the PlayStation 3 (via the PlayStation Network) Tekken 5: Dark Resurrection is an update of Tekken 5.
Simplified: Tekken 5 was re-released on the PlayStation Portable as Tekken: Dark Resurrection (known as Tekken 5: Dark Resurrection in arcades and on PlayStation 3) with new stages, two new characters, one extra returning character, an online mode, new costumes and more.