Not much, a bit of texture work was done in the past months, but the major issues since our last status update remained the same: without official technical specification/data/support, creating realistic tires in the given tire model can't be done by Modders in any sensible time scale right now.
Re-hatching this thread in the hopes CTDP update it now as Studio 397 have DX11.. Such a great mod that should be in rF2.