don't want to be rude, but what exactly are you missing? you have usb3, thunderbolt, hidpi screens, excellent battery life and quite capable processors. of course, not the latest&greatest. oh and not to mention the build quality and ecosystem.
i use mine to for drawing and CAD modelling, and until now i hasn't felt i'm limited in any way. probably you do some killer apps that require the most recent CPUs from intel.
if it is for me, i'd skip those gimmicky rumoured touch-strips on the "next" mbp, and i do quite well w/o nfc or touchID on my notebook. but that's just me. and also i do not upgrade my gear yearly, probably like every 3 years, probably that's why i am not so disappointed by not seeing every year a new laptop.