You can say that again, by the time MS fixed all the Spartan glitches(if they could), Chrome would provide something new and fancy.
Actually MS released such "fast output" of 10049 with Spartan because they have a target to enter RC(WEP, or fbl-whatever) in mid-Apr, which is supposed to be feature complete. I have heard of a branch testing Metro2, but guess they decided not able to make it.