A long time has passed since the last update, but now we’ve advanced the version and release numbers to 2.4 and Vorple works together with Parchment and Inform 7.
The new release is out now although the web page hasn’t been updated yet. Here are the direct links:
The release includes five extensions: Core, Hyperlinks, Multimedia, Notifications, and Tooltips. Each add features previously unattainable with any major authoring system.
Note that this is essentially an alpha release—as the documentation mentions, there are a lot of known (and unknown) limitations that will be fixed in later releases. It should still be a good taste of what the system is capable of.