Unfortunately, if it's like other ThinkPads I think the HDMI output requires the discrete GPU.
Looked up on different forums and people had quite some trouble with Linux and nvidia cards, so I'm really not convinced.
I've read as well on reddit [1] that the key travel is actually less than on the classic and newer chicklet style keyboards. Will wait until people report how the typing experience is with this keyboard. I don't care about the looks, but the typing experience is really important, because I'm spending all the time on the keyboard and though I love my T450s, I have to say that it's far from the IBM Thinkpad keyboards (although it's seems one of the best for modern laptops).
I'm still not decided.
[1] https://www.reddit.com/r/thinkpad/comments/74drfl/thinkpad_2...