That was my point. Lack of lead time. The same reason (or at least one of the reasons) why Buddy Complex is flopping now. To be fair, I think Free was also officially announced just two months before it aired (even KnK was announced first), but because of the swimming anime hype, it didn't really matter.
I can't help but think that Tamako was a filler anime, which was intended for KyoAni to buy time for Free and KnK.