It already does hovertext, but it was just being obscured by the buttons as a bug previously. Keith has mostly fixed that.
Regarding showing counts, what we used to do in Classic was show a count of how many more you could build. I'm not sure which is better -- though with the extra width that we have now, we could potentially do something like "5 / 100" or something. But what does that mean? 5 out of 100 have been built? 95 out of 100 have been built?
I guess for someone new coming in and seeing 0/100 and 0/10 and so forth all over the place, that would clear it up.
Anyhow, I bequeath that entire issue to someone else.
It's a good one for mantis or similar, but it's out of the scope of what I was brought in to do as a hired gun on those buttons, haha. I'm mostly keeping my head out of the interface except where it relates to the graphics pipeline.