With the official reveal of Disney+ and the confirmation of a Loki series on it, there will obviously be more Marvel series on the way and Rocket & Groot may be one of them.
According to The Hashtag Show, who stress they can not verify the rumor, a Rocket & Groot series may be coming to Disney+:
“It’s been told to us that among the series being pitched to Feige is one that might mean we won’t have to wait until 2022 to see more Guardians of the Galaxy action. We’ve been told that a Rocket and Groot series may be in the works!”
Although THS couldn’t confirm the rumor, other writers from film and Disney sites have heard that something like this could be a possibility; so even though it’s a rumor there’s a slight chance this could end up happening.