Everyone seems to be hopeful that SE will rework AST skills with this change but I have the strong feeling they aren't going to change much of anything. They are just going to put AST in Diurnal the entire time and remove Nocturnal. I really doubt they are going to go back and rework or add new skills prior to level 90. AST will just get the new set of skills from 80 to 90 like the rest of the jobs.