I've had this idea since FF11. I'm not good at writing down my ideas and conveying them properly and they're usually cooler in my head so forgive me if some of this doesn't make sense.

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I think adding the element of position, movement, and timed abilities to the game will add a lot to giving strategy to the battle mechanics.

Position

The one thing I really enjoyed in FF11 battle system was how some abilities involved positioning. For example:

Thief:

Sneak Attack: Extra damage when done from behind.
Trick Attack: Give enmity to the player in front of you.

Paladin:

Guard: Take damage for player.

During the early years of FF11, nothing gave me more fun than a party that setup a proper skillchain to the weakness of the mob, positioned well, and the tank kept hate.

Movement

I think by adding movement abilities plus abilities which have position properties will add a lot of strategy to the game. These abilities allow you to change your current location to strategic spots.

Movement abilities to put you in front of a player, behind the mob, in front of the mob, in line on two mobs, in the middle of the mobs, in the middle of the party, away from current targeted mob, etc. Just with those alone you can start building up fun and interesting strategies.

The movement abilities are like the instant abilities of FF11 (aka, Provoke) and the animation can be like the Dragoon's jump ability in FF11.

Timed

Timed abilities are like the abilities of the Goblin's Bomb Toss in FF11. In FF11, the good tanks were able to counter this ability because there was a short amount of time where the tank could run away from the party that they wouldn't get caught in the blast. Giving that short window of opportunity for the player to react, and when the player reacted wisely, not only imbued a sense of accomplishment for the player but for the team as a whole.

With the ability to know when a mob is to perform an attack, players who are paying attention can perform strategic responses like this.

With these three types of abilities/skills in the game, I believe, a lot of strategy can be made during combat. Already I can imagine dynamic combat where people can react and create strategies according to the parties make up of abilities, the mob's behavior and abilities, etc.

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That's my two cents and I usually lurk more than post, but I had such high hopes for this game that I thought I would share this.