You can adopt as many as you want. As Pernelle said - The Knuffel has been here for a while and everyone who wants to adopt it had a fair chance.
But something that I have requested from users before is to please not just buy a Knuffel for the sake of it selling out and then, as soon as the new Knuffel is there, dropping it back to Knufftropolis. I still see this happening ocassionally: A Knuffel sells out, we put the new one online and bam! - 10 of the old ones are immediately back in Knufftropolis. I think that's just kind of rude.

So don't adopt it, if you don't
want it.
Also, the new Knuffel isn't finished yet, so even if you adopt them all, there won't be a new one. I have finished the art and all, but starkad didn't have the time to work on it yet, as he has been busy with the summer event and is also busy with exams right now. I am sure he'll manage to add the new Knuffel sometime during the week, but it's just not there yet.
