I think the browser version is a great option, although that just depends on how well it runs in the browser.
But I could have sworn Ashley mentioning in one of the posts that there was still a way to use it as a standalone if you wanted? I could be wrong, but I think the additional pluses through the browser outweighs any desire for me to have an app version.
Being able to be at work and on lunch just open a new tab on my work Mac computer and be able to mess with my code sounds pretty awesome.