"Rick and Morty" Season 3 is speculated to air in December of this year despite the reports of the animation being delayed. Mr. Meeseeks is rumored to return in the upcoming season.
According to a report in Jobs & Hire, it is likely that "Rick and Morty" Season 3 is to premiere in December this year since the first season aired also in the same month. In fact the series writers already shared in a report that the upcoming season for the animated series is indeed to air later this year. However, there is no exact date as to when it will officially air.
There are also rumors that Mr. Meeseeks is going to return in "Rick and Morty" Season 3. This information has not been confirmed as of yet. If indeed the character comes back to the show in the upcoming season, then he should have a good angle to make an impact.
Meanwhile, a report in CSN indicates that the show's creators made minor changes to "Rick and Morty" Season 3. These changes are based on the Broadcast Standards and Practices. The show is known for its controversial content and so is the basis for making minor changes.
The show also faced controversies regarding its violent content. Show creator Justin Roiland expressed that it may not mainly be about the violence but rather about the sex content in the series. These changes though are minor ones and do not alter the whole plot of the story in "Rick and Morty" Season 3.
It already has been reported by GameNGuide that "Rick and Morty" Season 3 is facing a delay in production. This may be the cause for the airing to be delayed. It is also specifically noted that all the scripts are done and the animation part just takes time.
There is no specific date of airing yet for "Rick and Morty" Season 3. If the production will follow the schedule for the first season, then it is possible for the show to air in December. For now, fans need only to wait for any official announcements.