Hey Ashley, awesome blog entry today! Really awesome news; this has actually opened up enormous potential for my upcoming app!
I just wanted to report that on iphone 4s with wifi, ios6, and everything updated, that the sound (except for the sound that occurs when you yourself die) doesn't work in safari.
As a homescreen app, however, all the sound works as expected.
Also, while the performance isn't at all great in the browser, it is almost unusable (average around 14 fps, going down as low as 3 fps) as a homescreen app.
I thought I'd report this here to see if anyone else is getting different results.
Anyways, like I said, awesome news and thanks so much for the blog post!