They most likley have started working on games for the Wii 2!

Games I'm looking forward to:

Zelda
Conduit 2
The Grinder
Lost in Shadow
Xenoblde
The Last Story
Tales of Graces (if localized)
Pikmin 3
DQX
You Don't Know Jack (my uncle works for the company making this game)
Zangeki (again, hoping for localization)

This too.  I still think that's where Pikmin 3 and Wii Relax are headed, it wouldn't surprise me at all if Zelda SS was EAD's final Wii game.

Commercially, I don't think the need for a Wii 2 would exist if the current Wii was being supported with a steady stream of big titles.  Although its sales aren't as strong as in previous years, the Wii's 2010 has still been one of the strongest ever years for sales of a home console.  New titles would enable it to remain a very strong-selling console for quite a while yet, and would also likely generate far more profit than they would on a Wii 2.  As long as the Wii keeps outselling the 360 and PS3, and as long as Wii software sales remain strong, I don't see a Wii 2 being released - it would only serve to kill off a money-printing device for Nintendo and show Sony and Microsoft what they need to trump with their next machines.

With the exception of the Zelda game already mentioned in the original post, these games are all examples of ones either already released in Japan or which are currently only due for release in that territory.

Rhythm Heaven Wii and The Last Story are both Nintendo games and haven't released in Japan yet.  Neither's been announced for the west yet, but both are obviously coming.

Well I don't necessarily disagree Nintendo doesn't need to kill Wii, but that has little to do with EAD.  They won't continue supporting Wii due to commercial viability, they'll move on when they feel they want to... and by large it looks like they've already moved on to 3DS, and I don't doubt some teams are working on preliminary Wii 2 test kits either.  EAD always moves on a year or two before a platform winds down, and Nintendo usually fills the void with games from other teams and 3rd parties... I don't expect Wii to be any different.

As for releasing early, well it never seems to hurt when you're market leader, but launching too late can.  Look at PS2.  Then look at PS3...

Wouldn't Iwata have a say in what Nintendo's teams work on?  Though I would agree that the "Zelda team" wouldn't work on another Wii Zelda title after SS.

I'm struggling to think of examples of market leaders releasing early.  Sega launched the 16-bit gen while the NES was the leader and the 32-bit gen while the SNES led.  The N64 didn't launch until the PS1 was out, and that was the leader when the Sega Dreamcast started the next generation.  PS2 was leading when Microsoft launched the 360.

They may come, but are only scheduled for a Japanese release at the moment - I really don't see them making it to the west before E3 (which was the timeframe I was focusing on in the OP).  As for the inevitability of their arrival - I'm not as confident as you.  Rhythm Heaven DS didn't seem to do very well in the west, so I wouldn't call the Wii version a shoe-in.  The Last Story does seem likely given the backing it's getting from Nintendo in Japan, but it is a JRPG and a new IP - I'd say there's a (small) chance of it staying Japan-only.

the Wii will be fine with Zelda it's the Wii's fantastic back catalogue that sells the hardware. I do still think the Wii has another Mario Kart in it ;)