Just in case no one has posted this somewhere, I've installed the latest preview built Windows 10 today on a virtual Machine as well as PSO2. Once GameGuard updated itself, the game started. I didn't get past the password screen since it was a VM and was it lagging too much to do anything major, but it worked, GameGuard did not crash.
07/05/2015 UPDATE: Well, I've installed PSO2 on my old Media PC after installing Windows 10. Had to tweak the game by making it think that it's running under Windows 7, but it worked, sort of. I get into the game, but I can't stay over 1 minutes before it crashes, so ya, sorry for the false hope. That being said, I've contacted INCA regarding GameGuard, I've posted their reply in a new post in this topic.
07/07/2015 Update: If you launch PSO2, you'll see a GameGuard Update, this fixes these issues and PSO2 can now run on the latest preview of Windows 10
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