They decided to change the Chinook based on what customers said they wanted, as Sal tells it. I believe that some of the complaints had to do with the blade shape (thinking that there was too much material in front of the hole before the clip point started), and thinking that the point was too high to be of any real use. People also wanted a Chinook which they could carry tip-up if they wanted, and they wanted to make the knife workable for left handed folks. Not to mention the new steel. As I remember it, these were the reasons stated elsewhere as to why the design was changed. I'll probably pick one up, but I quite frankly like the older model better- if only from a cosmetic standpoint-, though I'm looking forward to the easier sharpening (relatively) of the S30V. Anyhoo, that's my two cents.
Sincerely,
Anthony