The authors of Pillars of Eternity published The Road To Eternity movie on YouTube, in which they told how the studio came to develop a retro project on Unity and what problems it encountered during its creation.
We strongly recommend viewing it. The picture is very well shot and covers all stages of development: from the idea to working on bugs.
The film, apparently, is also part of the campaign to announce the second part of Pillars of Eternity, teasers for which have already begun to appear.
Source: 80.lv