[Cry Me A River]

Astro,

Your list is far from complete - You can add the Snes, TurboGrafx-16, Genesis, Sega Master System, Atari 2600, Intellivision and Atari 5200 to your list. Not all added features (some like the SMS II removed them) and some were pretty much just cosmetic (Intellivision II). But you're right, releasing updated versions of consoles goes back to the earliest days...