First G500 deliveries imminent?

A picture of the 7th G500 has just come to light. This in theory will be the 2nd of this model to be delivered to a customer. I'm guessing from the colours that it's not for joint launch customer Flexjets. The first 5 are test aircraft and will probably be retained as such for at least a while. Gulfstream are suggesting that certification and first deliveries are not far away now.

N507GD (72007) via GAC