Interestingly, these tabards all feature the same twintailed design, but currently lack any kind of emblem whatsoever. While it’s possible that these are meant to show only solid colors, or perhaps normal emblems could be added at a later date, the inclusion of a blank gray tabard makes us believe that these tabards could have been intentionally left blank to allow customization in the style of guild tabards.
Whatever the case, this new tabard desgin looks very promising!