I found this, which could be a good thing:
http://www.hometheaterforum.com/forum/thread/303111/star-wars-on-blu-ray-fall-2011/1020#post_3839349
"In additional SW on BD news, our friend Kenny K. got the following information from a Lucasfilm e-mail:
"Industrial Light and Magic did go in and make many technical improvements, most notably color matching on select lightsabers shots."
So you see, what did I tell you? They lightsabers will be fixed for the Blu-Ray.