The UK Government had just produced its Brexit White Paper which can be read here
The text dealing with Ireland and the Common Travel Area comes to a grand total of 3 pages with two key commitments which are listed below;
4.9 We are determined that our record of collaboration, built on shared experience and values and supported by personal, political and economic ties, continues to develop and strengthen after we leave the EU.
4.10 We will work with the Irish Government and the Northern Ireland Executive to find a practical solution that recognises the unique economic, social and political context of the land border between Northern Ireland and Ireland. An explicit objective of the UK Government’s work on EU exit is to ensure that full account is taken for the particular circumstances of Northern Ireland. We will seek to safeguard business interests in the exit negotiations. We will maintain close operational collaboration between UK and Irish law enforcement and security agencies and their judicial counterparts.