I got a demo today and ordered a pair.  Will shootout with my current ls50s when I get them.  
I do think Guttenberg May have gotten the frequency range absorbed wrong in his video.

Still a lot of what goes into detail happens at higher frequencies (overtones) and the new technology is said to offer 90%+ absorption compared to only 60% before and the cabinets on all ls50s are very robust.

For now I will just say the demo was very impressive and leave it at that.

And, Guttenberg mentioned the internal bracing is improved in the Meta. It's going to be interesting to see if they measure differently than the original, assuming John Atkinson gets a pair (he loves the original).

I love the matte finish on the Meta, too.

Having heard both now in totally different setups I can say I do think the claims of the new meta’s sounding clearly different from old are likely true but still hard to say. 

Neither is a slouch by any means. 

I started a separate thread that I will post to with my observations regarding the two once the metas arrive. That will be more apples and apples. Stay tuned.
@mapman  If you are going to have both versions in the same room can you test out the following claim.

the LS50 Meta can also be operated close to a wall or in the corner of a room. We literally moved the compact loudspeakers and stands in front of the wall and one after the other used the supplied inserts to reduce and close the bass reflex opening. They effectively compensate for the bass emphasis caused by the setup.

This would a big deal for people with small rooms.