Well, I’m following any development on the ST front… It’s too early to tell at this point, but I understand that ST will continue to support groovy and custom DTHs for a while…
For the moment, I’ve been accepted (ecomatiqhomes) as a company partner for the new ST development platform…
As for Hubitat, I don’t think that it supports cloud to cloud integration (yet) …
EDIT: With the ST classic app, here is the ST answer about your concerns:
Regards