See also DEVONtechnologies’ Christmas Updates blog post, which ends with this (which is both a smaller font and lighter grey color than everything else).
While we have an internal release date for DEVONthink To Go 3 we don’t publish it yet as there might be unforeseen delays caused, e.g., by factors out of our control. We are not releasing it before the Christmas holidays, though, as we want to be available for customer support when we put it into your hands. Version 3 will also bring changes to the licensing model but we are not yet disclosing them at this point in time as we might make adjustments until the final release.
Emphasis mine.
There is already a third thread on the DevonThink Discourse where people are protesting this, but it won’t make any difference.
A DTTG subscription is coming with version 3. The only question is whether or not version 3 will be deemed “worth it” to people.
The good news is that the people who are on the beta seem to think it is a vast improvement. Here’s hoping.