Don't know how its being handled this time, but last time you actually had to call the Cheif Pilot support center and schedule the date with them. They would tell you what was available, and you chose the date yourself.

If that's the way its going this time, those getting invites should be calling early next week, if they've not called already, and dates should be known then. (I'm sure most that have gotten invites are busy getting their ducks in a row, and don't have alot of time for forum commentary, too.)