One reason there may not be much movement around the open Prometheus PCI is that the current firmware is pretty limited and lacks PCI to PCI DMA. I know Michael Böhmer developed a newer version with this capability. I've heard a few people have gotten their Prometheus cards upgraded. If that firmware was released more widely I think there would be some renewed interest. In theory that was going to happen at some point as can be seen here: http://www.e3b.de/prometheus/
Sadly, this was from some time ago so I don't think it is going to happen.
uhhh.... no! I did some Betatesting 2 Years ago for a new .card and .chip driver for the voodoo 3, wich was developed by Matatabs. The reason for this Picasso96 Driver was to ensure, that it works with BOTH Models of the Prometheus PCI (with and without DMA) an there ARE or WERE Plans to setup a new version of the Prometheus by Michael..... but I have no idea about the actual project-status..... Prototypes are existing AFAIK
Maybe we should ask him?