Maybe someone has answer to this:

Intensity 1.8.2 for Win XP, Server 2003 & Vista Ultimate
20 November 2007
This release adds: Sony Vegas 8 support (Beta), Improved Media Express support for 576i and general stability and performance improvements. Please check the included "read me" for more information.

does this mean a BM Intensity card would now work with V8 using a HDMI from possibly a Sony V1

Yes, it will work for 1080 60i but the image out the HDMI port will be contrasty. 23.976 only comes out at standard def for some reason.
-Robert