This has generally been dismissed. The answer given by the developers was the following:
"This is a question we actually receive quite often. Now, the short answer is no. But here is why. Every city builder needs features that make placing buildings challenging. In Elvenar, this challenge comes mainly from two sources: The one is that most buildings need a street connection, and the other is that every building has a fixed shape. The combination of this makes it challenging to build an efficient city. Of course, the downside of every challenge is that sometimes it feels like a burden. If you could rotate the buildings, this would make things much easier. But the downside of a low challenge is: when it gets too easy, it also gets boring quite fast. So, since this "city puzzling" is a core mechanic in Elvenar, we never implemented any technical base to make it possible to rotate buildings."