All I have seen recently is this acknowledgement by SmartThings…
As for this portion…
This one is a little tricky, eh?
Since Alexa Routines cannot be triggered by a switch, these virtual devices actually need to either be a Motion or Contact sensor at this point in time. So, the virtual switches must have both the Switch Capability to allow SmartApps to change their state, as well as Motion or Contact sensor capabilities that are mapped to ‘on’ and ‘off’ to allow Alexa Routines to work. So, this would appear to be something that 99% of users would probably never try to use, but it is very important to the 1%. BTW - numerous posts that the New ST Alexa Skill has broken using Motion and Contact sensors as Alexa Routine triggers for some users…
I know Hubitat has embraced virtual devices, making them easy to change the state of them by adding additional commands to them which can be called by Rule Machine, or any custom App. For example, the Hubitat Virtual Motion Sensor includes the active() and inactive() commands. This allows the device to only implement a single capability, while still being able to be manipulated externally.
However, Amazon Alexa can only change Switches, Dimmers, Fans, Thermostats, etc… in Alexa Routines. It cannot change the state of a pure virtual motion or contact sensor. So, I wrote my own custom Hubitat Driver that implements both the Switch and Motion Capabilities to allow my Ring Doorbell to act as an Alexa Routine Trigger (via native Ring Skill) , which then turns on my custom Hubitat Switch/Motion device, which then allows Ring Doorbell “Motion” events to be used like any other motion sensor. The custom virtual Switch/Motion driver also automatically turns the switch state back to off after a few seconds, which causes the motion to go inactive as well.
While the above seems simple to you and I, to the other 99% of users, what I wrote above is gibberish.
I wonder how much effort ST is going to put into making this much complexity work with the New Platform… 
I am still curious who is going to update the Lutron, Logitech, etc. integrations… (if they have not been updated yet to use the New ST Platform.)