will the unsold token be burnt?
I guess,thats standard and easiest thing to do with unsold tokens.
Is there any way those tokens can be reused for something else and not burned?
Well they can and some projects have done it that way but it usually brings concern from the community as those tokens could be used in certain ways that the community disapproves of.
They could always lift bounty rewards.
Can the team do that? If all tokens are not spent, can they make more bounty?
pffff, I guess they could, but that just raises the level of suspicion in the community. I don't know, that just dosen't seem like the best solution if you ask me.