That looks like a K1 and oilhead GS in the background of your "R90S press intro" shot.
Believe it's a fairly recent R90S gathering photo complete with a non-original black example.
Originally Posted by TINK
Found this very cool picture of what appears to be the R90S press intro.
Notice the black bike in the foreground; it has no silver smoke nor pin striping.
My guess is this bike was a prototype bike, or perhaps a color option BMW wanted to get press reaction to?
Regardless, this is how I plan to paint my project bike, straight gloss black. I like it!
PROJECT S > http://www.photosbytink.com/bmw/