@itix
is this effort being worked on by a single individual, or the entire team?
The entire team just like all hardware porting projects are.
at what point can SAM owners expect to know what on-board hardware will be supported, such as audio via the SM502?
I dont know. Better ask directly from Frank Mariak (pega-1) or Mark Olsen ('trollolol') at MZ when it is online again.
Integrated ethernet, SATA and USB ports must be supported or the board is useless.
are there any plans to eventually support newer radeon HD video cards, or will R200-series cards be the main focus in the immediate future?
There are no plans to support newer Radeon HD cards in near future.
In the immediate future the main focus is on r200 and r300 series cards. I dont see point for newer Radeon HD cards because many Macs have built-in gfx card and gfx speed is not our bottleneck.
But... never say never. One step at a time.