No real change except the "http:// for a beta user?
I only wish undoing the javascript disable from the urlbar was as easy.
It's been used as a security hole: A large-ish number of Facebook/etc phishing scams have had people copy javascript into their address bar.
For technical users, it's a pretty bad interface for writing and testing javascript.
Check out the Web Console or Scratchpad under the Web Developer Tools menu instead. It's really a much nicer way to run some impromptu javascript on a page.