Hell yeah, I played the guinea pig this week and i can tell you 2 things about this ( I am a registered Apple Developer btw).
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7.5.(2.0) installer does not work on Yosemite (So had to reinstall 10.9.3 (+ install Cubase 7.5.2 there) + then upgrade to 10.10 dp1)
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Although the installer is not working , after upgrading a 10.9.3 with cubase 7.5.2 installed, it runs perfectly here. I am seeing a little less cpu usage and my projects seem to load faster. All plugins (+installers) work in 10.10.
My system:
MacPro 2008 8-core, 8gb ram, Apricorn solo x2 (sata3 interface with 2x250 samsung SSD 840 in Raid0) ,RME Fireface 400.