"expected openings"On Alta's web site, under the Snow Conditions tab, there is a link to "expected openings". That will tell you what is open and what is likely to open each day. If you follow that, you may get a sense of where they are in terms of opening terrain.
As I understand it, after they get comfortable with Backside, Ballroom, and the Shoulder, they may start to think about Castle.
Given that Backside has been closed for the last week or so, I think the chances of opening the Chutes anytime soon are very remote. I am not sure about Devil's Castle. About half of that face slid around Christmas.