This is NOT an official release of Microsoft as of Jun20-2015
All reports indicate that they are legit, unmodified ISOs, but
since MS hasn't (yet) officially released them, you should not
contact them for support. If future upgrading fails, you should
search for official releases.

It has been noted that a 3dmark test indicated poor performance
on one person's machine, but at this time, there's no officially
supported graphics drivers. Also, some driver versions may work
better than others. You should treat this as a beta build unless
MS pushes it through fast ring, soon.

offline keys:
Windows 10 Core: KTNPV-KTRK4-3RRR8-39X6W-W44T3
Windows 10 Pro: 8N67H-M3CY9-QT7C4-2TR7M-TXYCV
Windows 10 Enterprise: CKFK9-QNGF2-D34FM-99QX2-8XC4K
Windows 10 Core Single Language: JPYNJ-XTFCR-372YJ-YJJ3Q-G83YB
Windows 10 Core Chinese Language: R3BYW-CBNWT-F3JTP-FM942-BTDXY

One change we have noticed is that using your MS account that
you sign up for Windows Insider program with, will activate this
version. This seems to be a change to tie in activation with
accounts rather than keys, tho the new offline keys reportedly
will work to activate. It should also be noted that because this
is a tech preview release, it is still timebombed for months later.

Do not contact me about activation or support. I expect you to
only use this if you know what you're doing.

keys and x86 iso originally obtained from WZT
enjoy,
murph