Alright, so it's kind of sort of a leak but not really. In any case, while Rogers is in the process of rolling out OS 10.3.0.1418 officially to the BlackBerry Passport, the files are also available for every other BlackBerry 10 device. At this point, you'll have to load the files manually but for anyone familiar with leaks, that shouldn't be an issue.
Worst case, you can hang around the forums and wait for some autoloaders to be uploaded, which are surely already on their way. If you do decide to take matters into your own hands and decide to give 10.3 a go, you do so at your own risk. You should always back up your data before loading any sort of OS files that don't come directly via the normal install process. You dig? You can find the files in the CrackBerry Forums.