Not sure how long it's been out but I found this trailer on the IMDb. It seems to be a combination of the original teaser trailer and the non-sweary bits of the internet-only trailer. If you want full sweary goodness you can go to the official Clerks 2 site, but here's the clean one for your delight (that wasn't meant to rhyme). I laughed out loud three times and it's only the freakin' trailer! Really looking forward to this, hopefully a triumphant return to form from Mr. Smith. 
http://www.imdb.com/title/tt0424345/trailers-screenplay-E27486-10-2
P.S. Sorry for the advert beforehand...
http://www.imdb.com/title/tt0424345/trailers-screenplay-E27486-10-2
P.S. Sorry for the advert beforehand...