On my way back from Charlotte NC yesterday I saw some rare metal: a new Korean Air 748.

Source: me
Interestingly, a Lufthansa 744 was taxiing just ahead of it so I could kind of compare the two side by side. Truthfully, beyond the lack of winglets on the 748 and the larger chevroned engines, I couldn't really notice that much of a difference. I realize that there's been a fuselage stretch, including the upper deck, and the wing has been re-done, but it was the wingtips and larger engines that stood out. Beautiful airplane, though.
I wish the 748 were getting more traction in the market so that we can regularly see 747s for years to come. I am, however, a huge fan of the 777 and stoked for the 779, plus I'm pretty keen on all of the modern twins, so I'll be pretty content as the 747 glides into a well-deserved retirement.