Well, one never stops to learn. The picture is from WD 113 (May 1989) and seems to be the first ever appearance of the White Wolves. The first mention of the White Wolves in an AB is actually in the 3rd Edition Warhammer Armies (1991), as an example of Temple Ritterbruden [sic], which were indeed all equipped with helmet/shield/lances. The descriptions there says (p. 56): "These are the Templars, religious orders of knights, including such brotherhoods as the Order of the Fiery Heart, who serve Sigmar, the Templars of the White Wolf, who serve Ulric, and the Templars of Myrmidia."