The main treasure in White Plume Mountain is the three artifacts - Wave, Whelm and Blackrazor. Way back when, Whelm got stats in Open Grave (since it belongs to the vampire Ctenmiir). Later on, Wave got stats in Plane Below, and WOTC previewed it here.
That leaves Blackrazor, the distant cousin of Stormbringer. WOTC ran a competition looking for good stats for it, and now they've decided to publish the winner. You can see the stats here.
That's all three artifacts covered, and two of them are free. I like it when other people do my work for me.