I figure life very likely exists in abundance throughout the cosmos, and so would exist on this water bearing planet lying well within the habitable zone of its host star as well. The report mentions "K2-18b's size and gravity would make it difficult for the world to support life" however I figure if it did sustain any life forms they would probably trend smaller and closer to the ground due to oxygenation and load on the heart. Just a guess.
Now excuse me while I point my Celestron PowerSeeker 114 Newtonian reflector to Saturn before I spill any beer.