Hi guys, thought I'd chime in from Liftopia.
We are still finalizing our list of partners this year and are always working to add more. I don't details on the Vail portfolio right now, and in the mean time we are working hard to build what would be a valuable partnership. One point of clarity, however, is that we have worked with Keystone for the past few years. My guess is Vail will be sticking to their best rate guarantees with regards to advance purchase of apples-to-apples products in different channels, so if there were to be differentiated pricing it would be likely a unique product type.
Sorry I don't have more detail, thanks for your patience! We'll be doing a new partner announcment in the next few weeks so keep an eye out, and we have some other very exciting news coming out shortly.
In the mean time, we are incredibly excited for the upcoming season and expect our partner list to grow to as many as 200 resorts (last year we had about 120).
Oh, and in case you know anyone, take a look at our current job openings, there will be more announced in the next week or so: http://liftopia.jobscore.com/list
Here's to a great season!