Wubi after -upgrading- win7 to win8

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http://askubuntu.com – I've seen a lot of question about Ubuntu and Win 8 on a new machine with windows 8 preinstalled and that UEFI stuff, but nothing useful about -upgrading- from win7 to win8 and Ubuntu. I have a win7 machine (no UEFI firmware) with a WUBI installation of 64-bit Ubuntu 12.10 and am looking to simply upgrade from win7 to win8. Will this have serious complications with my current set up, like with the pre-installed win8 machines? Will my Ubuntu install be lost in the win8 upgrade? Thanks! (HowTos)