Hi @kozmicblues,
Thanks for the feature request! This is something I have wanted myself for a while. That said, I want to implement this the “WordPress way”. A lot of work is currently being done on how to manage settings for different states in the Editor, i.e. hover, active, etc. This functionality would also be compatible with themes that use a theme.json file.
So it might take a bit for this functionality to get added, but it is at the top of my list. I have also gone ahead and added a GitHub issue for this enhancement.
In the meantime, you can manually add hover states using CSS. Not ideal of course, but here is some example code.
.wp-block-outermost-icon-block svg:hover {
color: red;
fill: red;
}
Best,
Nick