Apparently the finally have a publisher, and are expecting to make an announcement soon - there's a long discussion about it on this thread:

http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=431375#Post431375

But as to whether it's going to be available for the $20 Steam sale price is anyone's guess. I'd assume it's going to be more around the $40 standard Steam price.