Yes, there are reports but the pre-requisite for that is, GGG should have to win the fight against Murata in April and Canelo should do the same in May. Their expected bout if everything goes smoothly is speculated to happen in September.
GGG is interested but Canelo is not saying anything that can increase the chance of making the trilogy happen. Maybe because he was too busy for now to settle first his bout again Bivol.
Fans should now hope that GGG and Canelo will win their respective fight. If one of them loses, no chance for the trilogy as it does not make sense to do now.