Has there ever been a v2 of a nintendo console?
The DSi was an upgrade to the DS but not a whole new console generation.
The Wii Mini was a downgrade (seriously) to the Wii to make it cheaper/smaller.
The New 3DS was an upgrade to the 3DS similar to the DS->DSi upgrade.
Plus all of the Gameboy and Gameboy Advance models which you could argue were often more revisions with some new features but still compatible than a totally new product.
Such as the Gameboy SP and then Micro which were totally new designs for the Gameboy Advance with a better screen but otherwise the same console.
Gameboy > Gameboy Pocket Gameboy Advance > Gameboy Advance SP > Gameboy Micro DS > DS Lite > DSi 3DS > New 3DS
Some of these revisions even had their own sub-revisions or regional variants like the Gameboy Lite. The Gameboy Color is the only one I can think of they didn't revise significantly, but you could argue that the Color itself was a huge revision of the Gameboy Pocket with a Colour screen.
TV consoles are a different story. The NES and SNES had later variants, and there's the afterthought Wii Mini, and that's all I can think of.
Not to mention
