Well, it's not the i780 that the FCC just passed, it was the SCH-i617, aka the Blackjack 2. What's new about the Blackjack 2? It's, uh, prettier and it actually has Windows Mobile 6 (grr). It does look like the main buttons are placed a bit more nicely - reducing constant accidental pressed. It has a few more keyboard shortcuts, too. Ok.
Really, though, it looks like a pretty straightforward refresh of an already good product. Let's hope that Samsung had hidden some WiFi or GPS in there, hope against all evidence to the contrary.