If you're comfortable remapping the keyboard, all of this is pretty much a non-issue.
What's more of a concern to me, as someone who was hoping to buy the Haswell X1 as a Linux box, is the function-key row. Lenovo generally has a reputation for laptops that support Linux reasonably well out of the box, but if that function-key row requires extra driver support (i.e., if the BIOS doesn't set it up to emulate a standard keyboard), things could get awkward...
That much should work; word of mouth from other Linux users suggests that there's a BIOS setting to force it to be F1-F12 by default, and to be brightness/volume/etc via Fn.
What's more of a concern to me, as someone who was hoping to buy the Haswell X1 as a Linux box, is the function-key row. Lenovo generally has a reputation for laptops that support Linux reasonably well out of the box, but if that function-key row requires extra driver support (i.e., if the BIOS doesn't set it up to emulate a standard keyboard), things could get awkward...