Seems like the mystery has been solved, Samsung posted this on their global newsroom today:
“The B2B SmartThings Solutions Zone showcases SmartThings-connected home Internet of Things (IoT) control and energy management solutions.”
Here’s the link to the entire article, the section about SmartThings Pro is towards the end of it:
If Samsung thinks even 1% of smartthings customers are going to pay. Lulz, just shit it down now.
Interesting. As described there, SmartThings pro is similar to a feature They used to have for the property managers of multifamily buildings that have put Samsung smart appliances in each unit. That’s where the “SmartThings energy” feature started, for example.
This is a big business for Samsung in Asia, I don’t know how popular it is in other regions.
Devices can be set to alert property managers when they need maintenance or when something, like your HVAC system, is not working as it should.
Can’t tell from that specific presentation if it’s only going to be part part of a property manager package or if it’s also going to be something that will affect individual customers like most people in this forum. 
Because they are going to charge for it. My opinion.
