According to a Tweet from Community writer Matt Roller (which was later deleted), the show has been renewed for a second season. Details from the Splitsider article:
Community creator Dan Harmon’s new series, the animated Adult Swim sci-fi comedy Rick and Morty, has been renewed for a second season. Adult Swim has yet to confirm the renewal, but one of the writers who was added for Season 2, Matt Roller (Community), posted a picture of the show’s Season 2 writing staff on Twitter earlier this week that has since been removed. There’s no word on how many episodes the new season will be.