Probably rumour based on the "a few months after Brief Cases" estimate. I expect it would go up on his site as soon as anything was official.

Say the Wcv are all descendent from the same progenitor, such a ritual would remove their demon.
I have long suspected there is a link between Drakul and the BCV. So if the ritual is done on him, it could permanently deal with the BCV.

There is, but it's indirect. Per WOJ:

And also what is Drakul a scion of?
Drakul wasn’t a scion of anything! He was something entirely unhuman that got trapped in human form. Dracula was his half-human child, who naturally had enormous paternal issues, and wound up creating himself as the first Black Court Vampire in an effort to win his father’s approval.
It didn’t work out so well.

Stopping a hail of gunfire is pretty cool on its own, but imagine if Harry then fired back all that energy in one shot.

He's probably kind of limited in terms of making force foci not too powerful lest he accidentally violate the first law. Fomor servitors are the most likely gun-wielding enemies he'd be facing in the near future, and I'm not sure Jim has confirmed whether they're so far modified that they don't count as people any more.

Assuming Evil Bob was actually going to kill Harry, that means that either Evil Bob had free will, or Evil Bob still saw Kemmler as his master.  This later suggests that Evil Bob knows Kemmler is still alive.

He could believe Kemmler is still alive and be mistaken. He also blamed Harry for his personality split ("whatever you have done to my thoughts") instead of orange Bob.

He goes back, finds out that Sandra Marling was actually Mavra, and he kills her (she's been dead all this time and he didn't know it!) and claims the book for himself.  When Mab "last saw it", it was with TTH as he went back to the future. (This pretty much requires the Sandra=Mavra theory to be accurate)

Is there a lot going for that theory? I have higher hopes for Mavra's long game than a reveal that Harry went back in time and killed her so shortly after she disappeared with the book. Plus if she wanted Molly to go warlock, I don't see why she wouldn't just turn her and train her as a sorcerous vampire.

I don't think it's been proposed that he was working with his mirrors, has it?  It was just the he was using them as bodies to fake his death.

I'm not sure even the latter has been corroborated. He could as easily have been coming back from the dead by stealing new bodies like Corpsetaker was trying to as using MM Harry's body double trick.

It's tough to speculate on how Kemmler might have used the MM trick of getting one of his doubles killed in his place until we find out whether that spell finds the victim to pull across universes based on a resonance between souls or bodies. In the soul case, if Kemmler and/or his multiverse counterparts were doing fairly regular body-swaps from one living host into another (as opposed to the resurrection method of kicking a native soul out of their body) any alt-Kemmler whose current body doesn't match the current round of wanted posters is basically useless as a decoy. It works better if he's wearing Joe Smith's body and a drop of blood is enough to capture another Joe Smith, though.

Hmm, so if Marcone was the base level prize and Ivy was just a possibility, it could jive.  It still represents a metric f*ckton of wasted resources on a vague possibility, given that it took Lucifer Himself to fuel the huge Circles that were only needed for Ivy, a cost equivalent to having to deal with a Soul fire-empowered Dresden there-after.   

That was how I took it, anyway. They involved Lucifer for the sure grab of Marcone, a pretty good shot at involving Harry whether through his relationships with SI or Mab, and decent odds that requesting an arbitrator would be the only play available to him.

It's also important that as far as Nic's scheming goes as of SmF, he was still under the impression Lasciel's shadow was slowly working on getting Harry to fully take up the coin. For one thing, that means he couldn't have guessed Uriel would take the other side's freebie to balance Lucifer's action by granting Harry soulfire, since he thought Harry was still drawing on hellfire. Secondly, Nic very well might have been almost as happy with putting enough pressure on Harry that he had to fully give in to Lasciel in order to survive confronting her fellows as with actually getting Ivy. I doubt he would have shared with Tessa that he'd be happy to see the plan end up netting a nascent Starborn instead of the Archive, but if Lash had stayed on mission for them, it might actually have been a reachable possibility (supported by the fact that he tried to capture Harry after everything else went pear-shaped for them).

The question of Harry's eligibility for soulfire if Lash had still been there also prompts an interesting what-if. Given that Harry's access to hellfire had been via Lash' connection back to Lasciel, what would have happened if she'd survived turning on her originator instead of immediately sacrificing herself? I gather she'd lose the connection to continue giving Harry hellfire, but since soulfire comes from the caster anyway, could she granted Harry that ability? (I always figured Uriel using that as his balancing action was equivalent in acting at all, rather than energy expended) Or would Lash have been left as 'just' a cosmic storehouse of knowledge, without any hard power-ups to offer?