Now that I think of it, what if we'll bump into the WoDs in Thanalan (after they defeat Ifrit?) AND then by the end of Xelphaltol after they defeat Garuda since we'll be busy fighting in the dungeons? The ruin behind the mask man looks like Qarn and that zone has: Little Ala Mhigo, Corpse Brigade and Zan'rak.

This is speculation, of course. But I do believe that the solo trial might very well be in Thanalan and that we'll see them twice this patch.