I posted earlier in this thread, and my list remains mostly unchanged, but, updated for actually having the laptop, and using it for a month…
1.) BACKLIT KEYBOARD. after actually getting my FW12, this has somehow actually moved up
…from #1.
White text on gray keys is almost impossible to read from the light of the screen.
2.) physical buttons for the trackpad.
If it weren’t for the fact that it’s flatly impossible to find much of anything that has them, not having physical buttons would be an automatic dealbreaker for any laptop.
3.) still want waterproof, still cool with the fact that it’s really unlikely.
4.) means of attaching the stylus, because I will lose it.
The fact that my head is attached doesn’t stop me from losing it, it just makes it easier to find it again.
$60 on something I’m going to lose within the first day is hard to swallow.
5.) yeah, I want volume buttons on the expansion cards too.
6.) eGPU support would be nice too, specifically for the FW16 video cards and the external enclosure they report they’re working on for those…I don’t have a FW16 yet, but when I get my gen2 FW16(at least 6 months), and upgrade the video card(probably 5 years), it’d be nice if I could use the old GPU with my FW12…that being said, that’s far in the future, and I can just use it with my FW13, so even further before it’s helpful. (reusing old hardware when I’m home? sure, spend ~$300-$700ish to buy a video card just for a FW12? hell naw. )
all that being said, FW12 doesn’t need an eGPU, and I’m not sure the CPU and ram could keep up if you gave it one.
7.) still want a numpad somehow, still not sure how you’d fit it in the space available. still cool with that.
8.) yeeees, gimmie blue!
Green is my favorite color, but I like a lot more shades of blue than green, and sage is not high on my list of greens.
9.) not terribly fond of the keyboard layout, mostly when I’m reading, up/down arrows are too small, and pgup/pgdown share those keys…and FNlock doesn’t lock those, I’ll live, but it’s annoying. this one goes for the FW13 as well, don’t have a 16 yet, but it might be ok as is. arrow keys still look awfully small, and still shares the pgup/pgdown, but they’re also on the numpad, so…maybe?
a lot of people in this thread want higher performance, or better battery…I mean, sure, I’ll take it when it’s available, but both of those are fine. it’s not intended for gaming, but it’ll run a decent collection at acceptable levels, battery doesn’t last all day, but it’s long enough that most people aren’t going to have problems with it, and it beats the hell out of my MSI laptop from 2017, which, when set for maximum battery life lasted a whopping 40 minutes from full charge to shutdown, straight out of the box(and, yes, it got worse from there. there’s a reason I never bought another MSI laptop…actually a host of reasons.)
better screen though, while it’s perfectly fine for me as is(my eyes are…kinda…really bad.), better color accuracy particularly would be a big deal for drawing and similar tasks.
and yes, @NoriqNR soldered ram is, indeed heresy, please tie yourself to the stake, the inquisition will be there soon 
I have one laptop that has that, it should have been a dealbreaker. honestly if I’d found out it was using soldered ram earlier in the ordering phase it would have been, but I was in ‘decision made, details’ mode, and didn’t take the time to re-evaluate. if I had to do it over again, I absolutely would not buy that laptop again.(though, I will grant that soldered ram ranks fairly low on the reasons I wouldn’t buy it again.)
soldered ram is expensive, un-upgradable, and unrepairable, it’s just not worth it.
you’re free to be wrong…er…disagree, but I am not making that mistake again. 