This is my opinion:
The black 7-40 is very nice, but it must be placed where it will be hit by natural light - this will make the black alu stand out from the plastic and glass. Place it somewhere dark and the alu parts will look like they are made out of plastic.
The dark grey is eye catching, but perhaps mainly because it is "different" - at least to BeoWorld'ers that have seen one to many silver BV7 already.
The blue one isn't bad, but the red one is a hate/love color IMHO.
The natural alu edition is perhaps too common, but it will match any cabinet, speakers, stereosystem... and integration is the key here, even when it comes to colors.
Will it be shipped in September?
Roger