Kellyanne did in fact say to be determined. That is a safe answer for right now. I’m sure the initial plan will be to encourage them to leave on their own. Those who do not do so voluntarily would then be subjected to a force deportation process.
When Kellyanne says TBD I understand it to mean they are still working out the details.
When CNN says TBD they mean to imply that Trump has abandoned his plans as if reneging on his commitments.