Make this a thing on all realms in the future! I enjoyed the visual diversity in groups and it made me queue up for many dungeons just to see what I'd get matched with. From 48 to 60 I ended up doing dungeons with the same group of 4 Horde players (2 male orc, 1 female orc, 1 male tauren) and me as a male dwarf paladin, it was glorious.
Did you turn off the cross faction DF? I did 5 dungeons today and it was all Alliance in my groups, its killing my desire to do any more dungeons while leveling. I hate seeing all these guys playing with their pretty little barbie dolls on Alliance.