Final Fantasy XIV: Heavensward gives you early access and here is how to get it.
After pre-ordering you'll need to check the Beta Code section in your account for the early access code & the DLC. To redeem this code, please go to this website: https://preorder.eu.finalfantasyxiv.com/en.
The codes will work for whatever version you choose, although the pre-order items will differ.
For example, FFXIV: Heavensward will give you Early access as well as the Baron Circlet & Baron Earrings and Chocobo Chick Courier DLC.
Meanwhile, the FFXIV Online bundle pack will give you access to the Baron Circlet & Baron Earrings and Chocobo Chick Courier DLC.
Consumers buying the bundle pack will not get early access to Heavensward as you would need to have played ARR to a certain level before entering Heavensward.