Hi,
We will, but only if Retina technology become popular. Currently, it's not so popular although Apple advertise it everywhere. According to our site statistics, only 0.09% of our visitors have 2560x1600px (retina Macbook 13") and 0.01% of them have 2800x1800 (retina Macbook 15").
According to the reviews that I read, retina displays are great, but according to those reviews, it's questionable are they necessary. If this technology become popular and if other companies start to offer such displays, we will definitelly support that with our templates.
Thanks,
Milos