The Retainers are still available. I had to "Re-Obtain" them, due to the fact that the character customization had a complete makeover, which was cool because I was able to make the Mithra even more sexy than before.

I had access to 2 retainers in 1.0, so I was able to re-make 2 retainers. The cool surprise was that they both had both of their inventories already full from when I was stashing items there in 1.0. Also had a nice amount of gil as well because I had stuff up for sale all the time. The game saved the data, so everything will be there, you just get the option to recreate and design your servant.