First off, a heads-up that the Phoenix Lord of the Shining Spears has finally been named - the Iyanden supplement calls him "Drastanta, Tempest of Starlight", and includes his Celestial Lance as a (badass) wargear choice for HQs. The fluff on him mentions that he disappeared after Asurmen's last stand (well, before being revived umpteen times), but his Lance has been passed on from Eldar to Eldar. Yaaaaay! That combined with the "Wraith Spider" who miiiight be the Warp Spiders Phoenix Lord means we've got a more complete view of the PLs.
Wonder how the Shining Spear and Crimson Hunter Phoenix Lords handle needing a vehicle for their style of combat - perhaps their armour's built into their legendary Jetbike/Aircraft? I'd be pretty into Drastanta looking like some kinda Jetbike-centaur.
Also, does a Phoenix Lord NEED to be one of the students of Asurmen? I mean, we know from the Striking Scorpions that the Lord needn't be the primogenitor of the Aspect - could an Exarch who isn't from one of the original Aspects exemplify his/her Path enough that he/she leaves a strong enough psychic imprint in the armour for it to act as a Phoenix Lord?
On a rules note, how about using Battle Brother Dark Eldar allies to act as the Aspects who lack rules? Slicing Orbs of Zandros, Crystal Dragons and Eagle Pilots. Plus, seems like Power from Pain could be swapped for Battle Focus without unbalancing anything, and the changes to Exarch Powers makes them a lot less central to the "feel" of Aspect Warriors.