Each crafting task occupies a craft slot, with each character beginning their crafting career with a single slot. Players can unlock additional task slots (allowing more crafting tasks to be completed simultaneously) by completing crafting achievements, up to a maximum of nine slots. In addition to this new crafting system, the revamp will also introduce a contract system that will allow buyers to place orders with their crafters of choice, complete with the tools for price negotiation and the ability for buyers to supply the required materials to the crafters. When a contract is completed, the item is delivered directly to the buyer's inventory upon its completion, making for a hassle-free shopping experience. All the finer details on Wakfu's proposed crafting revamp can be found in the full dev blog on the game's official site.
[Thanks to Avaera for the tip!]