The missing abilities from version 1.0 up to the final 1.23 patch that disappeared into the changeover to ARR (like the GLA's Phalanx, Red Lotus, Circle Blade, Aegis Boon etc).

And while on the subject of GLA/PLD, either a new ability to greatly increase healing potency when cast on self (like an extra buff for Convalescence), or a default trait that increases healing potency. But just something to make the use of healing spells on GLA/PLD more useful than they currently are.