RBDOOM-3-BFG 1.0.1 released

Based on the Doom 3: BFG Edition source code, RBDOOM-3-BFG finally has a full version 1.0.x release ready. This brings the game fully to Linux and Mac OS X (including Doom Classic), with few extra goodies such as soft shadow support. A pre-compiled Windows version is also available on the release page. This does require the BFG Edition data files, so if you don't have it yet, it is presently $5 on Steam (you will need the Windows version of Steam to download it, even if you plan on playing on another OS).

Is compatibility with non-BFG archive format planned?

Not as far as I know.