If you're already on board with the WAKFU philosophy and wish to subscribe for a premium membership, then Ankama has a few great pre-launch offers for you. By signing up for three, six, or 12-month plans, you can net yourself plenty of in-game items as well as the esteemed title of "WAKFU Pioneer."
Ankama has also published a helpful chart illustrating the differences between the F2P and subscription plans -- such as whether or not you can become an eco-terrorist (we kid you not). Other differences include the ability to own a home vs. set up an in-game shop, how many professions you can master (six vs. 16), and whether or not you can run for office.
[Thanks to Derek for the tip!]