Patch Notes for 3.01 have the following new items:

Steam-powered Gobwalker G-VII
Minion
Gobwalker exhaust can be used to steam hams.Use item to acquire the steam-powered gobwalker G-VII minion.

Gobwalker Shielding
Part
Protective metal plating used in the fabrication of a magitek gobwalker G-VII.
So the Goblin Minion is crafted by Armorer using the Shielding, which is probably a drop from the Alexander Raid. Not sure about the mount tho.

There is also this;

The following optional items are now available for purchase from the FINAL FANTASY XIV: Mog Station:

Minion: Alisaie
Minion: Tataru

*sigh* more cash shop.