Final Fantasy XIV doesn't go out of its way to be massively accessible, Square-Enix is clearly making a conscious effort to avoid confusion wherever possible. The official player site has been steadily receiving updates about how game systems work and what's going on behind the scenes, with the newest update discussing Battle Regimens and incapacitating body parts in combat. The systems had never been discussed in-depth before, but they now offer players a chance to understand exactly what each system entails.
Battle Regimens are distantly similar in theory to the skillchains that ruled Final Fantasy XI's combat, but they have many differences in practice. Rather than being a chained deployment of specific skills, chains of general ability types will both buff the party and debuff the enemy party. Body parts, meanwhile, are targeted and damaged by certain weaponskills, with a helpful chart explaining what skills target what and which types of monsters can be affected. While it doesn't reveal the full details of Final Fantasy XIV's combat, it should provide players with an excellent place to start understanding the system.