The first thing I'd love to have is a bit unrealistic for how small the device is and the current form factor, but it is something I'd like! How about some type of Graphics Card that isn't an integrated chip?
NEW KEYBOARDS!!! Alacantra may be awesome and all, but I'd love a new metal version that has the same finish as the V, hang the extra weight... Or maybe alacantra on top, metal on the bottom. That's what Microsoft did with the Surface Laptop, so it is possible... How about keyboards with added functionality? I know this is probably super impractical, but with new ports, extra battery, or even ala Surface Book, some type of graphics card? Like I said, impractical, but AWESOME!!! And thick. .... and heavy.
NEW COLORS!!! I love grey, and I like the color on the V, but I can't resist dark DARK red, crimson, blue, and silver colors... Yes please!