From looking at the parts list, it seems like it ought to be reasonably easy to install and run linux ( even the WWAN card looks like it should work with the right drivers ) and yet it's not mentioned. It seems like they are missing out on a core market segment by not slapping a Linux Foundation badge on their website or box saying known to work with Kernel Version x.x and up. Or failing that I think both Canonical and Redhat would be glad to have their logo on there and all three orgs would only need a couple of days to validate on a pre-release model.
"awarded the status of Certified Pre-Install for Ubuntu"
"Certification notes: Hibernate is not working on this system"
1. http://www.ubuntu.com/certification/hardware/201309-14195/
Since I couldn't get Ubuntu preinstalled, I made sure to order the exact hardware specified on Ubuntu's certification page: A4-5000 APU, BCM43142 Wifi/Bluetooth, etc. I also updated the BIOS to the latest version, which had fixes for Linux.
I realize I was rather unlucky. The X140e is not a popular piece of hardware. Next time, I'll be sure to pick something widely used.
You have to request that image from the manufacturer. Probably through their support process. I don't know how it works for Lenovo.
The reason this happens is because hardware revisions and Linux kernel, and OS releases (e.g Ubuntu) are not in sync with each other. Eventually the changes for each hardware certification flows into the Ubuntu LTS release for that time. So, they probably went into 12.04.2 in this case. But, in some rare cases it's not possible for all changes to be taken - so generally it's best to get the preinstall image.
If linux is not working out of the box, I imagine it'll be working in short order, given it's a thinkpad.
The lenovo website says this exact model ships in 5-7 days [1].
[1] http://shop.lenovo.com/us/en/laptops/thinkpad/x-series/x1-ca...