The Klipsch MCM systems in theatres sound GREAT. The HPS 4000 is a modified MCM setup ( or at least it was years ago ). There are a few theatres in my area that use Klipsch. LaScala's for left, center, right and heresy's for surround. I wonder what system Regal will put in? If it is the MCM's it will sound great.
JBL is really common, most likely do to the cost. I think you can get into JBL gear for pretty cheap. I'm sure they make some really good gear but I know theres quite a few theatres with their cheap stuff and you can tell.