There's really no way to tell. They could very well get up there Wednesday and announce that Siri is now in full release and out of Beta. Only time will tell.
Yeah you're absolutely right. I was at a coffee shop with a slow internet connection when I posted that. When I looked at that same page the little yellow 'Beta' didn't appear (it's the last graphic to load) by the time I looked and left the page. I'm not kidding. Try loading that page on a crappy internet connection.