Tony,
If Turkey openly gives her word you can count on them to honour it.
They would not want to "lose face",whatever the cost.
The problem is they are not making any promises at this stage.
And you are right,they will keep the Cyprus card till the end of negotiations.By then the status quo will become the pemanent solution.
Cyprus will be effectively divided between the EU and the USA.
An improved an fairer BBF type solution is the only way to avoid Partition.
I am sorry to say that my observations suggest both sides are slowly moving towards acceptance of "Partition".It will be a disaster and the end of the Cypriot nation as we want to have it.