Okay, I upgraded to version 2.3. I'm running the latest version of the Lincoln Way App (version 1.5). I see absolutely no difference with the app. So I don't know what we need to do to get the new features.
The more I read the app update release notes, the more I think that the majority of these new features are limited to the 2018 model year vehicles.
For example, for all the navigation functionality (e.g. using mobile device for up to date map info, sending POI's to navigation system from your iPhone, etc), they've put the number 7 beside the new feature list as a disclaimer. Looking at the main app details, (7) indicates: "Only available on 2018 Lincoln vehicles."
Now, that doesn't seem to be applied to the update that introduced the tire pressure gauge (which is oddly coupled with a 'distance-to-empty' feature which I've had since long before this update). It also doesn't seem to be applied to the update about remote locking when the door is ajar, although I haven't tried remote locking lately with an ajar door. The first time I did it, on SYNC 3 v2.2 as soon as the app update came out, it seemed to say Vehicle Locked even when the door was ajar.
2017 Lincoln MKX Reserve AWD (Midnight Sapphire Blue/Cappuccino)
2.7L GTDI, Revel, Technology Package, Canadian Touring Package
2017 Lincoln MKX Reserve AWD (Burgundy Velvet/Cappuccino)
2.7L GTDI, 22-way seats, Canadians Touring Package, Trailer Towing Package