Coming from the investor Q&A session held the other day. A question was asked about what's going on with third parties on Wii U and the stigma concerning Wii U's "low power". Iwata responded by pointing to their initiative to "expand the range of software developers" (outlined here), noting that they've already received inquiries from several hundred new developers--both companies and individuals--following their presentation at GDC for Nintendo Web Framework. He believes new, captivating titles will be born from this initiative that'll help them achieve that goal. Another thing of note is that the teams working on this sort of software (he points to Wii Street U and their video-on-demand software on Wii U, both of which use Nintendo Web Framework) are quite small, which allows for quick updates in a short time-span.

He also talks up their Unity deal (which they've just recently have begun offering) stating that hundreds of thousands of developers for Unity exist, including developers in emerging nations, and they've made it really easy to get them on board to release software on Wii U.

Finally, Iwata is aware of the fact that many people hold the belief that Wii U is underpowered, and feels they need to work on remedying such misunderstandings. Not only that, but he knows that there are some third parties that are actively supporting Wii U, while others aren't even giving it a second glance. He wants to fix this by creating a situation in which third parties not currently actively supporting Wii U will regret that decision once third parties that did support it start to produce hits on the system. Of course, this isn't going to happen overnight, and it's hard for them at the moment to persuade third parties to get on board given Wii U's current state. However, Nintendo is working on producing such results following Wii U's "re-vitalization" on and after this summer.

All info comes from question/answer 7.