Pretty much what they said. I have a dragon kite and <3 it. But while it is in my pet journal and is cageable, it has a message that it can't fight, rather than abilities etc. I suspect they decided that the model was too unwieldy for combat animations but they wanted people to be able to sell it, like the other TCG pets. I've opened up the idle animation in a 3D app and it's much, much larger than most.
Very sad, I wanted to see mine snatch up a Winter's Helper and drop it