I found one which is one of the MS samples for SPAs (which might be the only one for now):
ASP.NET Single Page Application (SPA) BigShelf
The complete tutorial on this project can be found here: BigShelf
Edit:
See this tweet from Steve Sanderson: https://twitter.com/#!/stevensanderson/status/171561402597773312
We’re setting up a website for Upshot/SPA right now. Hopefully will go
live this week! Sorry for delay.