I believe this is the thread you are looking for: http://layonara.com/threads/1284857-exotic-race-submissions-re-opened
In addition to what is posted there, as you noted celestial/demonic blended characters are no longer allowed. In addition to these two, if they are not listed in that thread as disallowed or restricted, you're welcome to write an application using the subrace in question. Just remember that the more steep the lore involved the more thorough the application process. I'm not trying to dissuade you, just making sure you're prepared.
~row
Ok, that's major part of it. Some aspects of LORE regarding allowed races are missing. ESA's, Level Adjusters, general information on the subrace. for example, Goblin (http://layonara.com/lore/goblin) is just a placeholder... there is no information.
Actually I believe all the races have full pages but not all of them are fully connceted. This is some of the back tracking we have to do to fix what was eliminated and will take some time. I do not have an ETA for when the lore pages will be caught back up to where we had them.
~row