That feature comes and goes. eBay could have been trying it out and it's only on some servers. It also was on your my eBay page with items you bid. The ones your winning were in green now and then too.
That is bad but not as bad as the omission of high bidders ID on active listings page. there is a thread from a couple weeks ago that was was full of complaints about both changes. Will those features return? We can't count on that.
