Next round of Macbook updates with Retina displays?

I'm curious as to whether the next wave to Macbook updates will come with Retina displays. First was the iPhone, then the iPod Touch and now the iPad - surely this will extend to their Mac offerings? Apple have proven with the new iPad and its display that they can match both the battery times and, more importantly, the price of the previous iteration of the iPad. A Macbook Air with a Retina display would be killer (truth be told, I'm about to buy one myself)!

What do you all think? Bit of speculative banter never hurt anyone! :D