It took more time than i imagined but we got winners :p
It's the second IdeaMan's info of the night, after the previous one about dev kits seals, etc.
Third-parties are left in a rather vague status about the system software layer/OS.
They are warned by Nintendo or informed through SDK documentation/warioworld of its expected features, but that's nearly it. A LOT is still unknown to them in regard to this aspect of the Wii U, and for example, the real dashboard isn't implemented yet. They basically are aware of the presence of a future strong software side for the console, a few functions from it, but don't know how it will look like, in terms of UI/interface, don't know all the features, etc.