Oh, of course, we're not going to see the Doom 4 running in a browser. Capabilities like these are nevertheless adding a new dimension to browser-based PC games. Who needs Farmville and cheesy Facebook games when you can fire-up a high-adrenaline shooter right there in your browser, without special plug-ins or local installations?
The Pointer Lock API should enable more than just great browser games, too. Google says the functionality will be useful for applications like "scientific visualization, training, simulation, modeling, authoring packages, and more."