Apparently the version that ended up in the release has a broken normal and/or specular map. 
r_normalmapping disabled:
r_normalmapping enabled:
For comparison, the version I provided, with clearly visible shading and smooth specular highlights around the white bumps:
Responsible for: Arch Linux package & torrent distribution, Parpax (map), Chameleon (map texture editor), Sloth (material file generator), gameplay design & programming, artistic direction
I think the texture still needs some green and orange in it.
The issue was caused by the lightgrid rewrite introduced in Alpha 25, it will look appropriate again next release (not the same, but similiar enough):
Responsible for: Arch Linux package & torrent distribution, Parpax (map), Chameleon (map texture editor), Sloth (material file generator), gameplay design & programming, artistic direction
