Not only does it run the latest stable release of Rails 3.2 (which was immune from the latest security vunerability), but I made sure we are running the latest versions of all Rubygems.

Having said that, this is very much an early beta right now. We expect to get a lot of feedback over the next little while, and we want to integrate that before we release a 1.0 stable that we'd be comfortable telling many people to install.

If you install it now, you'll have a more complicated upgrade path to our 1.0.