You are gnna half to wait for the Glorantha book for those.
Juding bny your post, I assume you are unfaimlar with Dragonnetws, so I'll try and give you a short rundown. This is very "quick & dirty" and I've take a few liberties to keep things short.
Basically the are humanoid lizard-men, related to dragons (immmature dragons). They hatch from an egg, but as they advance through life and gain a sort of dragon-enlightment, they reincarnate into more advanced formes. Dragonnews are immortal-a dead dragonewt is reborn back at the nest of his hatching. It is also possible for dragons to "loose the path" and stop advacing and these dragonnewts are not reborn upon death. SOme even mutate into different beings. Eventually, a dragonnewt can even be reborn as a dragon.
One thing about dragonewts is that they are very alien in manners an behavior. Unfathable by humans and probably by the other species on GLorantha too.
THere are fice stages of dragonewt developement- Scout (Crested), Warrior (Beaked), Noble, and Ruler. THere is another optional stage called an inhuman king when a dragonewt refuses to become a dragon, but that is more of a special case.
If you want. I can dig up some more detailed info and some older stats from RQ3. THese stats might not match up with the new stats when they are relased, but they will almost certainly be close enough to work until the GLorantha book comes out.
A character who is reborn as a dragonewt would almost certainly start off as a crested/scout (the lowest run), having just made the step from human (or whatever) to dragonewt on the evolutinary scale.