The FN Five-SeveN Standard is a new model from FNH USA. The Standard has fixed three dot combat sights, while the other models feature an adjustable rear sight.
The MSRP is $1316.56, which I presume is less than the other models because of the cheaper sights. I have emailed the PR person to confirm this.
The FN Five-SeveN chambers the 5.7x28mm which is a round marketed at law enforcement who can use it with ballistic-vest penetrating ammunition that is not available to civilians.
UPDATE: These are actually better sights than the other models which have a $1237.50. Thanks to David for the info.