iPod touch Touch 4g antennae hole gone, thoughts on the case material?

[cRuNcHiE]

I notice the black section of the back which was used for the antennae on the previous iPod touch has gone.

What are your thoughts on the material they've used for the back? From photos I've seen it looks less chromed and slightly more matte?

Could it be liquid metal?
I'm just wondering how it's going to affect the wifi!

 

[mclaren700]

from what I understand, and from videos i've seen, it's the same backing from last year, but just think of it being flatter.