I've just ordered a new X1 but I'd like to install Linux on it but keep the W7 install as well. I was going to try to clone W7 to an external drive and boot from that (apparently it is possible with limitations) but I've read that the WWAN card is a standard M.2 card. I've checked out the Sierra company that supply the wireless cards but I'm still waiting to hear if it is a B or M type connector. Looking at the image and checking other technical docs it look like a B type connector. I need to know if the WWAN card socket will accept only B type cards or M or even B/M cards. Thanks in Advance.