I've been able to install the game, and the launcher works fine.
The UI issues that people talked about (and that I have experienced first hand) seem to be gone. However I have noticed, at least on my machine (late 2010 macbook air), that there are weird flashes on the ui elements, sudden changes in colour, like there's something up with their rendering, though it isn't actually at all serious: they aren't often, and don't obscure any of the elements. What is noticeable about the ui for me, and I think this is because of my bad hardware, that the character that appears when you first launch the game, isn't shown properly, but rather as a grey silhouette. I was able to fix this by turning down the graphic settings to low. Again, I think it's just an issue with my hardware, and it probably won't appear on better hardware. Character creation works fine, in fact, everything appears fine, until the actual gameplay starts. I don't have any characters that have gotten past the tutorial yet, so I can't say anything about anything else, but when you do play the tutorial, everything works fine.
To the actual issues:
Everything is usable and playable, until the tutorial gets to the part about using the mouse to see. I have both a trackpad and a mouse, both of which instantly cause the game to freeze, and for a wine error to appear stating that there has been a serious error. I did find a small way around this, but I don't think it to be practical, that way being not use the mouse at all, and move to the next tutorial area, which asks you to use the space bar to jump. There is an ingame obstacle at this point, which can only be jumped over, but, again jumping causes the same error as before, but only at this point in the tutorial area. Seeing as there is no way past this point without jumping, I have been forced to conclude here. If anyone can see if these issues are just for the tutorial are, then I applaud them, and would kindly ask them to tell me because I'd like to play this game already.