Does anyone know where I can watch the gameplay demo for Bioshock Infinite?

So the new Bioshock game was recently announced and it looks like the coolest thing since Charlemagne claimed a monopoly on ass kicking.

I’ve seen the trailer and the website, but I keep hearing mention on websites about a gameplay demo. Unfortunately, my google-fu is weak and I can’t find the video of this demo (assuming it exists).

Anyone care to help?

Also, let’s discuss Bioshock and the possibilities of the new installment in the series (assuming you’re into that sort of thing).