Well isn't this just a lovely treat. Not only has the BlackBerry Z30 been announced officially, the leak game has just started to heat up. The latest comes in the form of BlackBerry OS 10.2.0.1743 for ALL BlackBerry 10 devices. Yes, this includes you BlackBerry Z10 STL100-1 users.
So after playing around with it, not much has changed it seems to just bring performance enhancements and bug fixes. All the same rules apply from the 10.2.0.1725 leaked OS, so if you need anymore info check out that blog post.
Again, this will bring Dark Theme SMS, BBM, Contacts and Calendar. BBM Channels will break dark theme on BBM, so use caution. Otherwise enjoy and play safe. As per usual CrackBerry is not responsible for any damage you may do to your device. Everything is install at own risk. For a complete tutorial on how to install leaks, check here