Yeah, I'm quite sure that 'The Scar' was depicted in the books as being on the left side of her face, so we don't know for sure yet. I'm to this day quite upset with Triss's scar removal, and I'm way too passionate about these characters not to care about things like that.
Knowing - broadly - what TW3 would entail, I knew that really major characters like Ciri and Yennefer were bound to be portrayed. I have been worried about it, to be honest; how incredibly important it would be for CDPR to get them just right, all the while recognising the impossibility of pleasing everyone. From what we've seen now (yes, I just found the thread with the hidden message, in which it's confirmed the woman we see standing next to Geralt and Triss is in fact Yennefer), I am not pleased, but it's also not catastrophic. Sapkowski never went into minute detail when he described his characters, but I always pictured Yennefer as taller, a bit sterner, and more mature-looking. This Yennefer looks 'too soft and young' overall, and her hair appears more brown than black, while Ciri instead looks a bit too pointy and angular, and also 'too pretty' in lack for a better description. She obviously is beautiful, even in the books, but the first impression from this trailer is that she appears a bit too made up, I guess. Oh well... like I said: first impressions. It could be worse, but it could also be a lot better. :/