Several DualSense controllers seem to already be in circulation, as hands-on images of another example have been published online. The latest round of photos also show the battery capacity of the next-generation controller, and it is almost double the one in the original DualShock 4.
https://www.notebookcheck.net/Leaked-photos-reveal-the-significantly-larger-battery-capacity-of-Sony-s-next-generation-controller.486106.0.html