Bummer that they cut the resolution of the icons in half, though.
They didn't. The icons were 16x16 before. They're 16x16 now. The only difference is that previously the icon files were 16x32 giving you a normal 16x16 and a "hover over" 16x16.
> Ah, OK... Well then, bummer that they got rid of the hover over...
The hover over is automatically taken care of by dimming icons not active and brightening them as you hover over just like all the other themed Vegas icons. So they still change when you hover.