Is there any update on the Hans-Jörg's new 3D API? His last blog on the subject was all the way back in 2011.
Sorry but I have no update on the status of the AmigaOS Gallium port at this time.
Warp3DNova was born out of the frustration in waiting for the Gallium hardware drivers. It also means A-EON is not dependent on the efforts of those working on Gallium and they can support older cards as required. A-EON is focusing on content and sometimes that means giving the OS a boost to get that content on there.
I was playing AmiCraftNova at AmiWest on my Sam460ex. Whether that works via Nova or Gallium or some other engine I don't really care and I doubt end users will either.