There's a lot of talk in this thread about CPUs, displays, and pricing, but what about form factor?
Having never owned an apple laptop myself, I am not familiar with their refresh cycle and what they try to accomplish. It's my understanding that the latest rMBPs were created in June of 2012 - if we're seeing a refresh 1 year later in June 2013, is it expected that this will be just an internal refresh of hardware components, or is it possible we'll see thinner and lighter form factors too?
Most refreshes are just spec boosts etc with current models. Only 2-3 years down the line do we see a complete redesign.
On the iMac we seen the 21.5 and 27 inch introduced in 2009 and from 09 to 11 we seen spec boosts etc, nothing in terms of new design.
The retina MBP's will see spec boosts when the time comes, what the future holds for the older MacBook pros is yet to be seen.