Teenage Dream: 3,849,968,729 streams from 8 singles
PRISM: 3,917,231,843 streams from 5 singles
Queen is not only going to become the first artist to have an era be streamed 4B+ times sometime next month with PRISM, but also the first artist to have two 4B+ streamed eras sometime next year (maybe).
TD could reach 4B just before 2016 since it gets more than 50 million views per month
She won't though, hopefully 50% of the new album is written and the general concept of the era is already in the works. She's touring South America so she can't record, I am afraid
If anything it could be out Q1 2016 which would be good to avoid concurrent releases with her competition