I would like to see the brush identified somewhere. On the current Mac version, if I use a brush, then another tool like the lasso, and come back to the brush tool, the highlighting showing the current brush is gone. (It's not supposed to do that, it's broken)
Even if it were fixed, it's not enough. Highlighting is good, but a better method would be to show the category and brush name (plus the highlight). For instance, a box could show a breadcrumb trail similar to how it is done on some web sites and file systems. Then if I go to another category I would still know which category and brush is active. I could get back to it. Otherwise, I'm lost. (Especially, when the highlight disappears.)
Having to mouse over the brushes to get the name is also cumbersome. I have to mouse over all the them looking for one I might remember I liked. We should be able to see the brush names displayed in the panel without having to mouse over them. Apple is really doing us a disservice by hiding the user interface so much and making us have to go hunting to find invisible features. In the name of reducing clutter they encourage hiding useful interface options. Dumb.