This has been bouncing around the Internets all weekend, but for a while it seemed dubious. Now more evidence is coming out and it's looking like the supposedly-lost-in-a-bar 4th generation iPhone that Gizmodo got their hands on is in fact real.
(John Gruber notes that Apple considers this phone stolen, not lost, and that Gizmodo bought it from the people who claim to have "found" it.)
Gizmodo has lots of details of the new phone (which of course may not be the final release hardware, expected in June), with videos, lots of photos, etc.
New features include a super high-res screen, front-facing camera, improved rear camera, flash, micro-SIM slot, and a significantly redesigned case, with a 16% larger battery.