I was comparing the BWG preview PDF with my BWR books to see what had changed, and I decided to make a list to help others adjust to the new system. I also wrote down any errors I saw so that Luke could be aware of them for later printings. I didn't note any changes that seemed to be made for clarity alone (like the switching of the order for describing task and intent). If anyone noticed any other changes, please feel free to add them.
p. 15 The text says dark gray is hard and light gray is easy, but the colors are reversed on the chart.
p. 66 Fate - Perception is mentoned as a skill that is already open-ended.
p. 16 Perception is no longer open-ended.
p. 26 Open tests have now been relabeld as Graduated tests, presumably to differentiate Open tests from Open-ended rolls.
p. 32 Let It Ride no longer tells players that they can call the GM on cheating if he asks for multiple rolls of the same stat or skill.
p. 41 Ob 2 Tests are no longer difficult for 3D rolls (they are routine instead).
p. 59 Evolving Beliefs or Instincts is only described on this page and is not mentioned in the Artha chapter (as it was on p.71 of BWR).
P.S. I'm not sure if this is the proper forum since BWG doesn't have it's own forum yet.