Not any time soon though... But it's apparently in development guys!
Valve, a game developer, has confirmed that they are actively working on developing Half-Life 3 through User Picker tool (an internal tool). The User Picker tool is used by the developer not only to manage personnel involved in the development of projects, but also to track the projects currently being worked on.
The whole point of using the tool is to avoid any member of the public, or individual who is not involved on the project, from accessing information from it. The tool should therefore not be seen or accessed by individuals who are not working on the project. However, in a rare gaffe, the company made it accessible. As a result, gamers of the series got the chance to get a glimpse of the entries for either Half-Life 3 version Core or Half-Life 3. The former might be the name of the technology utilized with the current title.
Please be excited even though I don't give a ****.