Ansible version 2.5 is expected to be released in March 2018. There are no major changes from the current stable release of 2.4.2. Since the software world is always a moving target, a good place to keep track of what may or may not change is to follow the roadmap and porting guide:
- Ansible 2.5 Porting Guide (https://docs.ansible.com/ansible/devel/porting_guide_2.5.html)
- Ansible 2.5 roadmap (https://github.com/ansible/ansible/blob/devel/CHANGELOG.md#2.5)