BigRig has good points... but I will also add that there are still a good number of folks that aren't eligible for upgrade due to flight time and/or age. The current vacancy has a lot of CA upgrades for both the 900 and saab and it will tell a lot as to what kind of FO movement we'll see. I suspect the upgrades will go a little more senior for FOs because this class will be after the holidays are over.
A higher time guy just might luck out, if the current FOs are tapped out for upgrades and it goes very junior to a high time FO... like it did last year before we had to hire street CAs.