Are you a Rogers customer who purchased their BlackBerry Passport from Rogers but haven't received 10.3.1 yet? If so, you might want to go ahead and check for software updates if you don't already have a notification showing. As reported by several folks in the CrackBerry Forums and Twitter and checked through Sachesi, Rogers has now officially released OS 10.3.1.2576 (Software version 10.3.1.1779) to BlackBerry Passport owners.
This OS has been around in leaked and official form for quite some time now for ShopBlackBerry and Amazon purchased devices, so there's plenty of information about what's new and what's not already available but, for the most part, it's just fixes over earlier 10.3.1 builds that caused issues for some folks.
Long story short, if you've not updated to any version of 10.3.1 on your Rogers purchased Passport, then this is the one you've been waiting for, so go ahead and get yourself updated and enjoy OS 10.3.1.