Since we now have both a horde and alliance side, it felt appropriate to differentiate the two factions somehow. From now on, Alliance will have the old pure white tabard whilst the horde side will have a pure black version. The design otherwise is identical.
In addition, the old octupus icon has been changed to something more fitting and now has two serpents intertwined to symbolize the union yet difference of the two sides.
Here is how they look:
Naturally, the uniform designer will also undergo change as alliance characters need to be added with the current selection, whilst horde characters will be added with clothes that match a black tabard better.