We're in the process of redesigning Jira's issue view to help you get more done. We're working to make this view simpler, more intuitive, and more consistent.
We are constantly updating and improving the new issue view. As features become available, we'll update the subtasks of this issue to let you know what's changed.
You can also stay up to date and get more info about the new issue view by watching the new Jira issue view page in our documentation.
Note: What is and isn't a distinct feature can be tricky to define, especially in something as involved as the issue view. We'll do our best to capture things as accurately and comprehensively as possible.