No, the answer is that you don't know since there is not enough information to give an answer.
Mm, I disagree - I think you're being too picky. There's enough information to be reasonably sure - not totally, of course - what's going on: it's either a biased flip or a loaded coin.
Can we be totally sure? No, of course not. But the question doesn't ask "what will definately happen next?", just "what will probably happen next?"
Nonetheless, I think the point has been made. But I forgot what it was, come to think of it.
Anyway, Rrhain, by your own logic from another thread, your answer is no answer at all.