That's funny, I assumed they just ported over the same content found on the DVD release. Why they decided to suddenly dig up a worse quality trailer is weird, what about the rest of the BD bonus features? same material?
I doubt Lucas himself is responsible, but you never know, I guess it's a good thing to show the kids how awful the quality of the original film really was. ;)
I first aimed high, and wanted to include a lot of material but at this stage I will just be glad if I can finnish the main feature. I own a copy of the 2004 reg 1 DVD, I don't know, I could perhaps drop the LD transfer into its menu structure and modify them and include the radio spots posted on starwars.com etc, I also received some very nice hi-res scans of that original trailer some time ago.