The market will depend on it's exact spec - a full track specific bike will not have brake calliper drillings, bottle cage bosses or any other bosses/mounting points. Some track wheels do not have any braking surfaces.
A road use fixie will have some or all of those "features", front brake only and no bottle cages is a very limited market for road use (I did run that spec for commuting and audaxes up to 400K 'til the frame cracked, but current audax fixie is a fully bossed frame with mudguards).