Not exactly a fair question. WebCoRE IS the ‘anything like Core on new app’ version that works with NewApp and the spiritual successor to CoRE. I use Webcore with newApp all the time. So if you’re discounting WebCoRE - no. Otherwise, Yes, it’s WebCoRE. WebCoRE’s current publicized plan includes updating WebCoRE to use the Rules API announced at last year’s dev conference ‘sometime in the future’ - but that’s dependent on the Rules API supporting variables and a few other things that it doesn’t have yet* (I say yet, because the Rules API guys have also said those features are planned). But, at least we know it (WebCoRE) has legs. CoRE doesn’t.
If you’re looking for the thread on the changes upcoming that will support custom capabilities - go here: https://community.smartthings.com/t/custom-capability-and-cli-developer-preview