I dont think the 1070 will be coming to the XPS line this time around. The XPS 15 is not a gaming laptop and although a1070 would be nice for productivity on a 5k screen it really isnt necessary. There are much cheaper computers that 'gamers' can buy, plus if those said gamers wanted to spend a little more they could get a high refresh rate panel with g-sync on their laptop, i dont see why a gamer would choose this machine. I play the occasional games, but i do have yet to play it on my XPS 9560. I will most likely upgrade to the 9570 as if the rumors are true about the 8700HQ I want in!
Also although i really like my 4k panel on my XPS laptop, I don't know if its really needed. I find myself scaling all of windows up, dont get me wrong the pixels are great but..... I don't know if I need it. Also the amount of extra battery life could really come in handy sometimes.
This is just my .02. I did read that dell may be working on a touch bar of their own, do i think it will be in the 2018 XPS, no, but i do believe with the feedback apple is getting they may make something along those lines.
Finally I know the rework will be in 2019 but does anyone else find that the XPS 15 seems to always be covered in finger prints. I wash my hands a lot and still i find it with the little smudges, which i do not like. I almost wish they used the same metal at the outside of the laptop inside. The feel of the 'carbon fiber' is nice.
Finally do you think with the 2018 getting an additional Type-C port it will get rid of the old charging method and use the usb C as a charging port? Also will we get a NIC back, and does anyone miss having a NIC on their laptop? I have it on a dongle but I really love the fact that on the XPS 15 i really don't need a dongle.