Crafting
The concept of FFXIV's armoury system is so you can be and do everything with just one character. Along the way, crafting became a little too hardcore. First, it started requiring everything to be HQ or bust. Then you it started requiring you to max-meld every piece of gear, and eventually you needed to do it for all jobs. What started as 'can be anything' twisted into 'must do everything'. While it may have been enjoyable for the really hardcore who enjoy this kind of gameplay, it pushs away the people who just want to do a simple bit of crafting now and then. With the Meister and scripts system, we're trying to get back to our core philosophy.
Same problem with Gathering, everyone ended up gathering the same thing, creating an oversupply thus making it difficult to create useful craftables for battle. In order to give more meaning to craftable gear/items and implment the next materia system, we need to control the supply of items and create differentiation between each gatherer.
It's probably terrible balance-wise to have dungeon drops always be the strongest so we're trying to change that.
With the new system, once you're at 60, you can then become an apprentise to each respective guilds' guildmaster. You'll gain new skills and recipes by becoming a meister/specialist. You can have more than one trademeister but there'll be a delay before you're allowed to switch.
The new crafter scripts, temporarily called red and blue chips. You collect them by polishing up and raising the quality, in terms other than NQ/HQ, of some items.
For gatherers, each region will have something like folktales, their own lores and stories. You won't be able to see the new nodes unless you've already heard of these tales. These are were scripts will come in. Besides that there are also talismans that you can use to reveal these nodes.