A quiet patch for the augment pool: Spell Split was taken away from Caitlyn and Bard, Echo Cast from Sivir and Surge Field from Yuumi.
Riot doesn't publish which augments each champion can be offered, so augment pool changes are worked out from what players pick. An augment counts as added to a champion when it was picked this patch but never in the previous one, and as removed when it was picked regularly in the previous patch but never in this one.
Removed from Champions
Bard
Caitlyn
Sivir
Yuumi