I think the prices of developing a retail Wii game are quite a bit less than the other consoles
No doubt, but for that you don't need WiiWare.
The Wii DevKit costs 2000$, unlike the ten tousands for the other console ones.
And I don't think that it will be like XNA, but more their libraries they have built up since N64 days, now in a more userfriendly way.
But they actually mentioned this SDK to come long before launch.
Its just that they still do not give more information on what it actually includes ^^
And what sony does: what is doing since 12months+, going down the toilett and re-replacing the CEO ^^
Seeing that Nintendo was able, even if only short, to surpass Sonys market value was kind of a shock, cause sony is working in so many sectors, Nintendo isn't ... shows quite clearly how bad sony is doing its job.