Thanks; From that link I go this.
Fotohuis (Robert) Pro User says:
FP200 120 roll film Batchnr. 010656 4 expiration date 1/2015 has clear Polyester layer and smooth backing paper. Films ok.
FP200 Batchnr. 010156 3 exp. date 2/2015 has light blue polyester layer and smooth backing paper. Films ok.
So the way I read it is the film with the LONGEST EXP date is BLUE and the "OLDER" stuff is CLEAR.
Maybe they think their new film will age faster / go bad quicker?
Looks like stuff with a date of 2014 or earlier will be blue. At least that is my guess.