The nbg95 comes in 'graphite' black and 'silver' gray now. The nbg98 comes in red and yellow too, but these colours are only available in Japan at the moment.
Yup, this is also in addition to the gold they have out. It's in their 2008 catalogue too. http://www.yonex.co.jp/digitalbook/pdf/badminton_string&shuttlecocks.pdf
Anyway if you want the nbg95 in different colours, you must order it from Japan, which is going to be quite costly.