My favorite has to be the one that some spiders might dream. "Jumping spiders rapidly move their eyes and twitch during rest, suggesting they have visual dreams, never before observed in arachnids."
The runner up is either a new world record for largest freshwater fish, a 661-pound river sting ray, OR, finding the new global record-holder of the tiniest land snail title, with a shell width of 0.6–0.68 mm and a shell height of 0.46–0.57 mm