We’ve always displayed the full task details on the task View Page but most people work from their “Tasks” tab, Dashboard or Everything page.
When looking at a bunch of tasks it was hard to quickly find out who and when a person created a task or who and when a task was completed.

 
This month we’ve fixed this nuance.
If you put your mouse over an active task for 1 second a new tool-tip is displayed showing who created the task and when they created it.

New Feature: Quickly find out who and when a task was completed or created | Teamwork.com

Similarly, if you click the Show Completed Tasks link under a task list in a project, hovering your mouse over the title of the completed task will display a tool-tip detailing who completed a task and when they completed it.

New Feature: Quickly find out who and when a task was completed or created | Teamwork.com

This saves a lot of navigating to get some important data.