It was available a few days ago, it just wasn't announced on their blog.
It's awsome that they use git, it's slowly starting to replace SVN.
Wow, this announcement reads like a word-for-word rendition of a feature suggestion I made two weeks ago! It's almost as if the Heroku developers are reading this site and implementing user requests at lightning speed!
Many, many thanks. I've got to try out the emacs and git stuff.
Can you expand Heroku to support Scala/Java development?