From experience its down to loyalty points, so if you have enough you will get first choice. if not they will wait and see if all tickets sell before it gets to your loyalty bracket. if that makes sense.
Basically if you have 100+ points as a season ticket holder you are pretty much there. 50 or less season ticket holder will take priority over a member with 50 points
I have 70odd points, but i have a feeling last time you needed like 96 for the first cut off then 82. Dont even know when tickets go on sale! I was on the lfight that got cancelled to Moscow, so i am going this year!