CHARIS has a narrow field of view (the team couldn't even fit all of Neptune in the test run), so it's most likely to be used for targeted observations rather than sweeping the sky. And when the planets have to be larger than Jupiter, they're very likely to be gas giants rather than anything habitable. Still, the technology could be immensely useful when it becomes available to the wider scientific community in February 2017. So long as scientists have access to Hawaii's Subaru Telescope, where CHARIS is located, they'll have a relatively straightforward way to measure bigger exoplanets -- not just confirm their existence.