bypass wait-list:
http://www.pcmag.com/article2/0,2817,2469675,00.asp
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steps for getting your windows 10 key:
-clone or back up partitions/files as necessary, the traditional w10 upgrade path will prevent new OS's from being installed, and may lock your partition arrangements with an "OEM" signature (annoying) enhancement across your w10 OS drive array. or simply pull our your primary drive, use a mock drive with 8.1 installed on it.
-if the device manager seems complete with your drivers, then backup windows/system32/drivers + drivers store
-install as upgrade, your programs and settings from 8.1 will attempt to retain itself
-create recovery media here:
https://www.microsoft.com/en-us/software-download/windows10
-extract your product key within windows 10 OS using extraction tool:
http://www.belarc.com/free_download.html
the tool may identify it as an 8.1 key, but in fact will work with a fresh w10 installation.
-wipe/remove/add drive and set aside appropriate allocated space for your w10 partition
-boot from w10 ISO (must be correct version; pro or non-pro) and enter w10 product key that was recorded from extraction tool
-proceed with setup.
-connecting to the internet will activate your 'matching' version of windows.
-any missing drivers, refer to the old windows/system32/drivers + drivers store folder that was saved from earlier.
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other notes:
-teamviewer as of july 2015 has issues with virtual desktop on w10
-fresh install of w10 preferred over upgrade path - no old programs move over
-primary windows 10 wallpaper looks grainy and low resolution-like (sad)
-w10 gets even more plain and boring compared to w8.1, and seems to steal the layout of the usual popular default linux skin sets.
-classic shell works in w10 !!!!
-w10 start menu inferior to windows 7 start menu, it seems
-virtual desktop is nice, but could use some work with the default hotkeys...
-no more charms bar... (good and bad)
-windows + A = action center
-tiles in the start menu are a bit absurd...
-multi-boot works with win7/win8 on fresh install
good luck!!