Pepsi's launching new product

Pepsi will launch a fruit-flavored diet cola this summer named "Jazz". As mentioned in the article "The diet cola category is still growing and both Coke and Pepsi already have flavored cola offering which have done well." The purpose of luanching new product might be an attempt bring more excitement to it's flavored cola family which is popular with consumers now.
Since diet cola made by Pepsi or Coke are pretty much substitutions, the two companies are seizing the market share to gain more profit.