Alongside class sets, collectable cosmetics, and other rewards up for grabs in Patch 11.0.5, we've also discovered new PvP cape and tabard appearances teasing at a future season of The War Within!
Unfortunately, players may have to wait to obtain these appearances, as they do not yet appear to be used with any obtainable items.
Instead, the pvp_11season3_d_01 name on their associated icons indicates that they may be meant for as late as Season 3, though this could also just be placeholder and be in preparation for season 2 instead.