Alec Meer from RPS spent some time with the PAX demo, post PAX: http://www.rockpapershotgun.com/2012/10/16/card-hunter-preview-2/#more-128036
So this makes me wonder any chance at all you will be putting up the demo "campaign" on your site so people can play it at some point? I guess your concern might be for the poor server it is on when thousands of people try to play it at the same time.
I was really kinda hoping they'd do something like this. Anything to soothe the burn, really. Though us non-PAX-goers first shot at the game will still likely be the beta.