At the time of writing, the Photography StackExchange proposal is in private beta, and I shouldn't be able to view it.
However, I can see the RSS feed at http://photo.stackexchange.com/feeds
This is by design.
They allow read only access to the site because the point behind having a private beta is so that people who are committed to the site can begin to shape it in it's early days.
Being able to read the data cannot interfere with that process.
Check out StackMobile. You can view the data on every one of the sites, private or not.