Sometimes I'm observant... and sometimes I'm not.
How long have we been able to hover over a reply (the Latest part) to a Forum topic - and see the reply? Did someone break out the tinkertools again?
I get it randomly in Chrome and Firefox (the latest greatest versions) and very quickly. I'm not sure what it is I hover over that brings it - it's definitely not the title of the thread though. I think it might be the author of the thread that brings the hover.
Hahaha! This is truly the first time I've noticed it. I'm always looking for stuff like that, so wonder how I missed it before. Ah well... fun surprise.