If this is indeed their plan, though, there is a pretty big flaw in it. Why are they trying so much to get "inspired" by Mac OS, when they should be trying to get inspired by Windows, and make it easy for the many more Windows users to transition easily from Windows to Ubuntu? As a Windows user, this is why I find Linux Mint Cinnamon (also based on Ubuntu) so much easier and less frustrating to use than regular Ubuntu. Of course Windows 8 is completely changing the direction for their UI/UX from the "old Windows" style, too, so there's that, but I have no reason to believe it will be successful, yet.
Turns out cheap looking Windows clone that can't run most Windows apps isn't really what the market is looking for.
Of course they are inspired by what Apple is doing (so is pretty much everyone now, including MS) but I think Unity/Gnome3 are different enough to stand on their own merits (or lack thereof).
I'm not sure what Canonical would get out of a partnership with Dell though , since their software is free they aren't going to get a cut on units sold.
Canonical charges 20% transaction fee for each app sold http://developer.ubuntu.com/publish/commercial-software-faqs...
They do want apps that integrate well with Ubuntu. So if you write an app that integrates with Ubuntu One or with Unity then you're going to have a better chance of winning than if you write a plain GTK+ app. So that will probably tend to keep these apps in Ubuntu and out of other distros, but that's the extent of that and I don't think the goal of it is to keep apps out of Fedora or whatever.
Ubuntu-as-a-platform can make opinionated choices what to support. This is why when someone asks "How do I make an application for Ubuntu" you can answer with "Quickly and Python" instead of "well that depends."
It's nice to have a default.