So, on a hunch, I asked Google. We perhaps might not be surprised that it says the answer lies in marketing reasons...
Apparently the new colour scheme reflects a more anticipatory mental state...
Either some marketing guru making a packet for nowt OR (and I strongly suspect this myself) they've done the research and found some evidence to support it.
For a business of that crazy size even a 0.5% boost to business by doing so makes crazy amounts of money...
