I believe we will continue to see changes in Gen 2 of the MBPr. The minor speed bump was like Gen 1.1.
Having used Apple products for some time now, you tend to see Apple release a Gen 1 device. Gather a years worth of data and then make changes accordingly.
I am interested in what they do with the MBPr Gen2. I think they will address the following issues reported by different people:
Ghosting and IR
White spots along the bottom of the screen
I'm not saying everyone has all of these but over the course of ~ year people have reported issues like these.
Apple -like any company- can only do so much testing before you put it in the field with millions of people can use the product in a multitude of environments which Apple may not have thought of.
Should be an interesting WWDC.