Well, the Naomi 2 was an update to the Naomi... Quoting from System16:
"Naomi 2 has four time the amount of main memory and graphics memory that Dreamcast has, and twice that of the naomi so ports from Naomi to Dreamcast may involve more conversion time and a great loss of texture detail. Also note that the Naomi2 board has four times the sound memory of the Dreamcast, and the reason for this is because the Naomi board isn't meant to spool redbook audio from the GD-ROM drive."
Also the Naomi 2 is "backwards" compatible If Im not wrong. You just need a GD Rom Drive like the one he has though, just like with the normal Naomi.
Well, except the first "proto", my list was about the same :P I was kinda with doubts about that first video because it seemed like a tech demo to show the game a little. Its nice to hear its a prototype, shame some stuff was cut out of it. I'd be awesome to find that one someday :P