Hello there, reviving this thread. I've found some more information.
Wookie Groomers HD Broadcast was released sometime 2007.
TO be considered containing more details in the highlights than blu-ray.
Harmy was supposed using this "version". And Neverar talks about this in this thread: http://originaltrilogy.com/forum/topic.cfm/Neverars-1080p-Star-Wars-Color-Correction/post/687112/#TopicPost687112
See original information about Wookie Groomer's Present release in 2007
http://originaltrilogy.com/forum/topic.cfm/Wookiegroomers-1080p-Star-Wars-Saga/topic/8203/
And mentioned here:
http://originaltrilogy.com/forum/topic.cfm/Wookie-Groomer-HDTV/topic/7914/
I just can't figure out if this is a truly original broadcast, or if it's a Special Edition 1997/2004 HD Broadcast that was made prior to the Bluray release. Somehow it seems to be an original GOUT broadcast I've never heard about it anyhow.