Future generations? What's that? Is that even a thing?
Right now as we're still creating the second generation, this seems like something that could come in mid-future rather than near-future. With the further generations there might be slight changes in the creative direction and these generation may or may not consist of Phantoms. Other creatures that could interact with our Phantom Bunch could be an idea as well. Of course, there are different directions we could go into but these are protected right now.
We will see more after the sales of the second generation. After the second generation, starting with the third generation wouldn't be a good idea since there are utilities that need to be implemented first but as soon as utilities and staking are up and running, a new generation could come out at a time when you're expecting the least.