Not yet. No way to order a Silver Sport with black band, and no way to order the Space Gray Sport with anything other than a black band.
Thanks for the confirmation, it doesn't make sense to me at all unless Apple really wanted people to be bothered enough about those options to spend another $200 for a Apple Watch Stainless steel so they can get their silver and black.
I will say the other watch bands are very nice but all are overpriced quite high. A sport band shouldn't be more then $25 tops and the $150 bands should be $50-$60. Shame really but I guess Apple is still making plenty of sales.