In Philadelphia, unisex restrooms have been gaining in popularity. All that I have see are just a bunch of single stall toilets, I have never seen urinals either in the open or in stalls and would probably turn around if I saw them in the open.
The point is to minimize the amount of space used for restrooms while having enough to keep lines and complaints to a minimum, so having a second room and infrastructure (plumbing, footprint, maintenance and cleaning) would seem to defeat the purpose of unisex restrooms.