My concerns are processing power, if I get the blue option, it won't suit my needs, but if I get the silver top tier, then all I really care about is the color. Or also depends on whatever option they are giving away.
#1 : No USB-C. Even if I ignored "futureproofing", I want to charge all my portable devices with a single charger / cable. On top of that, not being able to charge from a powerbank limits the potential of a device. (I currently have the Surface Pro 4 and it died on me during longer days with lectures / labs throughout the entire day). Ideally, I would have liked to see Thunderbolt 3 with eGPU support, given I edit home / YouTube videos.
#2 : No "real" pen support. I need to take hand-written notes / diagrams / sketches. Not being able to do these defeats the purpose of a portable device for me. I don't know why Microsoft didn't opt for a "Yoga-style hinge". That would have kept the slim and elegant profile, while retaining the 2-in-1 feature without any compromise on the laptop part...