I am just learning disc this year (absolutely loving it, both before/after the rework), though I am not proficient enough to have answers trained into me for different scenarios in pvp yet. On my rdruids I generally know what to do on a basic level, and some of that general stuff transfers over, but priest is a different game.
When you go into an arena, rbgs or random BG, what things are you often considering / doing as a disc priest?