Brian “Omougi” Ferguson has spilled the beans on Tradeskill Apprentices at EverQuest2.com:

What exactly IS a tradeskill apprentice?

A tradeskill apprentice is an NPC that you can hire to work for you in your house. You will need to be tradeskill level 10 or higher before you can work with a tradeskill apprentice.

Who are these tradeskill apprentices anyway?

The first tradeskill apprentices available for hire will be Coldain dwarves. Now that Velious has been reconnected to the rest of Norrath, the Coldain are eager to learn the advances in tradeskills that have taken place during their years of isolation. They’re offering their considerable skills at research in exchange for the guidance and mentoring of crafters from the mainland of Norrath while they learn.