Big SPA projects need to have an architecture for the code, some structure. Current examples for SPA are suitable for small apps, so some docs/examples/guidelines for bigger projects would be useful.
Derick Bailey has started a blog series on the new SPA features, which you can find here: http://www.kendoui.com/blogs/teamblog/posts/13-04-18/a-day-at-the-spa-with-kendo.view.aspx. He'll be following up with docs and screencasts over the coming months.