Looking at historical releases it looks like there was approx. 6 months between 0.6 and 0.7, I'd expect 0.8 to drop in the 1st few months of 2011.

There is a development version of SmallLuxGPU (SLG), which you can find in the source repository and in the weekly build forums but, from reading the forums, I got the idea it's currently only accepting input from a special version of the LuxBlend exporter.

If anybody knows better I'd be happy to be corrected. :)

Software: OS X 10.8 - Poser Pro 2012 SR2 - Luxrender 1.0RC3 - Pose2Lux
Hardware: iMac - 3.06 GHz Core2Duo - 12 GB RAM - ATI Radeon HD 4670 - 256 MB