Well, I have to concur with the positive side, because my main machine (3rd generation i7) is doing better with C7.5 than it did with C7 (even though I had no problems with C7). The VST Performance shows less “jitter” in general. I.e. not necessarily less load (hard to tell), but it shows a more “even” (or tempered) activity. The ASIO Guard is turned on.
Oh, and I created a new C7.5 template to start new projects from. I.e. I am not using an older template, because that seems to have caused various problems in the past for people, so I figured it would be worth a new one for each new version of Cubase.
I am likely building a new machine over the holidays, unless I get occupied with other stuff. 
We will see how a 4th generation “Haswell” CPU will do for me, in comparison with the current happy news.
Bugs will be ironed out over time and I will certainly enjoy the winter with the new fixings that came with C7.5.