The team just posted an update about the Unity 5 version on Kickstarter. Click below to read the full text:
https://www.kickstarter.com/projects/redthread/dreamfall-chapters-the-longest-journey/posts/1395548
The update also includes a list of the highest priority bugs we're working on. It's very technical, but possibly interesting, and we believe in full transparency.
tl;dr: things are progressing, there's a long list of issues, everyone's working hard to fix them, fingers crossed for a beta this week!