First, congratulations on the new release.
My main concern is about the JUCE documentation, which I've been extensively using during last week. The major problem is that the Search box is missing, and that was my most used feature for finding classes and methods. I'm sure you're aware of that, but I'd kindly urge you to restore it asap. Documentation is mostly unuseful to me without a proper Search button.
Also, as others pointed out, I also think that the new font is less suitable to show the documentation that previous one. My personal impression is that it causes more eye strain and is more difficult to read in a continuous basis.
One additional minor point is that the documentation (and the site in general) now puts all texts in a narrow column in the center of the page. While this looks like a move towards a coherent website design, I think it doesn't fit good with a programming documentation site. I'd suggest you to consider other options for the docs and tutorials, such as making them a sub-site with proper styling (good examples are ReadTheDocs and MkDocs).
Hope this feedback helps you!