It will be hard to compete with the free Stanford courses.
Especially since the sample looks like it's almost the same format.
It would be better to go the Peepcode route and have ala carte mini videos about specific tasks. How to make a digital photo filter, how to get CoreData working with iCloud, how to make a complicated UI, etc. There are a lot of materials out there about beginning iOS development. There are not very many materials about intermediate-advanced iOS development.
The other option would be to really amp up the production values. All video lessons I've seen, including the Stanford ones, are simply too slow. I usually watch them in 2x speed. The other problem is that the Xcode view is never optimized. It's always slightly difficult to see the text. Much moreso if you are watching it on an external TV set.