These might be answered somewhere in the WOJ or elsewhere, can someone more knowledgeable than myself shed some light on any of them?  Failing that, I would be perfectly happy with some fanfic-titious guesses at some answers as well.

•   Is Nicodemus part of the Black Council?   Who exactly is the Enemy he is fighting against?  Do he/Lucifer and God simply have different ideas about how the fight against Outside should be conducted/won?
•   Sidhe don’t have souls, right?
•   What would someone see if Harry Soulgazed them?
•   How did Harry’s father die?
•   What is the nature of Dragons?  Are they perhaps multidimensional creatures who only appear to be what we can perceive of them?  Sort of like the way a 2-D creature would see us as incomprehensible and/or invincible.  Only a few things can affect them, Faith in particular.  One could represent Dragon’s involvement with the entirety of the mortal realm as we might regard a literal pen and paper game.
•   How would Molly react to a magic circle?  Could it be used as a soul-o-meter?  Can she still make them herself?
•   Can Molly un-Lady-ify?  Get promoted to Queen?
•   Emissary is an office, does it have an associated Mantle?  Are there other similar offices?
•   Information on Warden Wild Bill Meyers, who is he other than a caricature cowboy wizard?
•   Is Kincaid a scion of the Goblin King?
•   Does Hendricks have Magog’s Denarius?  Could that be what is making him smart enough to get his doctorate?   Can he be former military PMC or is that making his past too busy?
•   Is Marcone all human?
•   What is the nature of being corrupted by Nemesis?  Is it voluntary?  Gradual?  Are you conscious of it?  Nine Rings-y?  One Rings-y?  Like the Fel corruption from Draenor?  Can you break free of it?
•   Would Mother Summer’s Intellectus be fooled by Nemesitic corruption due to it being from ‘outside’?
•   Where is Mavra keeping the Darkhallow?
•   Would a Foo Dog adopted by a villain become evil like how Mouse has become more Harry-like or is their nature inviolable?
•   What do Black Court vampires eat?  Are they Anne Rice vampires?  Is it the whole blood-drinky thing Buffy talks about to create one?
•   What are the names of the various Courts of vampire?
•   If magic causes fluctuations in physics and chemical interactions, it explains why certain devices work rather than others.  Butters would love to set up a long term experiment with clockwork in an area of high magic, an area of fluctuating magic, and a control area of no magic to compare differences between the three.  He might be unable to determine if it is physics changing gravity/chemical interactions, or the flow of time, or perhaps it might not even make a difference either way.
•   Who wants the Blackstaff back?  The Celts or Fomor perhaps?  Is it Mother Winter’s walking stick? 
•   What is the process for getting a place Accorded Neutral Ground?
•   Are there Tolkien elves anywhere?
•   Are the Faire Kings actually kings of Summer/Winter?   WoJ sometimes conflicts with itself…?
•   Do mantles change by hierarchy (WoJ), preparation (Cold Days), or proximity (Harry’s viewpoint in Cold Days)?
•   How much does Lara know about the Long Game from Papa Raith’s library?
•   If Gard can handle iron, why do svartalves not like it?   Why was Harry’s summoning circle so cheap?
•   Did any Rampires survive?  Is it possible for a Rampire to simply not eat after turning?
•   What was Ferrovax in charge of?  What was Siriothrax in charge of?  Info on Pyrovax?  What can you tell me about dragons?
•   Faith cannot possibly be just a little girl. *I* barely know what a coat from the set of El Dorado looks like, let alone her.
•   Will Mother Winter start getting over her cough now that the Winter Lady is back on the job?