I've got the itch to replace my late 2013 13" rMBP, but I feel a bit guilty because it still works really well (other than some screen flickering when watching full screen videos).
I have 8gb ram, 256gb ssd, dual core (obviously). Would be cool to double everything and go to 16gb/512gb and quad core at the same size.
Not huge on the touchbar and usb-c only, but I can live with those. Main thing is if they update the keyboard or not, as the keyboard on this 2013 model is quite good.
Just got that new hardware itch. If they don't update the MBPs I might consider the Dell XPS 15 or (less likely) maybe one of the Thinkpads. I'm kind of shocked at how well this MBP has held up now though after almost 5 years, so my first inclination is to stick with Apple.