I really like the new design and its various color schemes, but it appears that the only way to toggle through them is via your profile. What happened to the Quick Style Chooser?
There are many more changes either planned or in progress, some obviously being bigger than others. Many will come in little pieces and/or stages, and some will not be visible as they are rewrites of the backend (most of which dates back to vb3.0 or before).
As an example, the release/install counts added to the members profile page is only the first part - a few more bits are likely to be added to that page as well (so will be visible changes) - but then the whole system it uses behind the scenes is also planned to be updated, a fair bit of work that will not have any visible results, just make upkeep and future changes much easier.