As many of you may know, this year marks the Clannad anime's tenth anniversary and because of the Anime Japan 2017 rumors, it raised the question of whether there will be a new project or not. Despite the lack of evidence to support these rumors, I believe there is still some room for speculation.
Just a few months before, the Clannad spin-off sequel Tomoyo After was recently released on Steam, which was why I thought they would a***te that if anything. Some have said that it doesn't make sense to correlate a Western release of a game with an anime adaptation, but I feel Planetarian's case could argue that. Planetarian had its initial release in 2004, then a Steam release in 2014, then got an anime in 2016. Even though it's an old game, it recently got an anime. Tomoyo After has similar dates with its initial release in 2005 and a Steam release in 2016. Then right after the rumors came out, Kud Wafter was officially announced to get an anime adaptation. The fact that it's also a spin-off supports the chances of a Tomoyo After anime happening.
It seems ideal to announce it when celebrating the Clannad anime's tenth anniversary, but there's no guarantee it'll happen in Anime Japan 2017. There have been concerns of whether it would be announced as a Clannad related project or not, because Tomoyo After is its own brand. But I think it would be a smart decision to announce it as such, because it could draw much more attention, especially to the anime fans who are not as familiar with the visual novels. Other than Harmonia, which is still relatively new, Key pretty much has anime adaptations of all their other projects, so I believe a Tomoyo After anime is very possible in the future.