Back on topic.. are there previews daily, weekly, randomly??
I was there Monday and they did not appear to be doing any previews that day. I walked by numerous times hoping they might, but to no avail. I was impressed at how fast they got those signs up, though. I was there on Wednesday of the previous week and there was nothing. I'm sure it was to promote it in the Christmas Parade, but it was impressive to see something appear so quickly.
On an annoying sidenote: they had security guards placed outside of it, telling people they could take pictures of the signs because they would show up on the websites. Obviously, that didn't work too well, because the sign appears on this website already. And, of course, I just waited until the guard was distracted by one of his CM buddies and took pictures, too. I'm evil that way.
On another side note, I'm tired of the bad rap Stitch's Great Escape gets. Personally, I find this attraction a VAST improvement over the Alien Encounter bloodbath attraction, and like I did during my visit in May, I made it a point to go on Stitch twice last week. Not once in any of the viewings - or afterwards - did I hear anyone say a bad word about it. People (including children of all ages) were laughing, smiling, and enjoying themselves. And so was I. I even heard one younger boy say it was his FAVORITE attraction he'd been on so far...and he was at Animal Kingdom at the time. I'm sorry if so many of you hate it so much. Some of us feel otherwise, and when it is constantly referred to as the worst attraction, when junk like Pooh's Playful Spot, LMA, that Narnia walkthrough thingy, and Under New Management are far worse, it really annoys me. Of course you have a right to hate it, but I think it's liked far more than you might care to admit.