Avatar_Emil said:

Not really. The 5.1 mix is made of 3 parts:

1. Restored mono track

2. Isolated orchestra angles

3. Isolated music and effects track

Out of all of these, there is but one change found only on the mono track and that is the removal of Judy Garland's stutter around when she says "Oh, Toto!" in Kansas. And really? They are removing the mono track for the 3d rerelease this year? What's your source?

I was lookin on Amazon.com at the packaging of the upcoming BluRay and DVD release and it said English 5.1. No mention of the mono track.