I'm not sure. I'm thinking of returning my 1.1 to buy a 1.3 refurbished, so I hope soon.
5K iMacs were in the refurb store after three months last year. March 2015 MBAs are already in the store and have been for a while. However, there are no 2015 MBPs either so it's hard to say. They might want to hold off on the rMBs considering Apple *still* hasn't even caught up on initial purchases. It's Apple. Who knows.