Warhammer Online's 1.4.8 patch goes live today! The major feature of this patch is the introduction of a single RvR currency, the War Crest. All vendors have been converted to used this new currency, so all of your old crests and insignia's will need to be converted.
Converting them to War Crests is easy. Just head over to your capital city where the RvR gear is currently sold. There you will find two vendors, one for crests/medallions and the other for insignia's/emblems.
Next, you'll purchase bags using your old currency.
Finally, you'll convert the bags (ctrl-right click) which will result in War Crests!
Be sure to check out the full patch notes.