In what might as well be AW 4.2, build 973 was publically released just a few hours ago. This version is “the special effects” build, including graphical additions such as environment mapping (glossy surfaces), bump mapping, shadows, sub-rendered surfaces (projecting a camera feed on an object, aka poor-man’s reflective surfaces), dual texturing, and support for .x file formats intended for next-gen avatars.

See the AWiki for details.